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Computer Science It

Kiev, Kyiv city, 02000, Ukraine
February 29, 2016

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Replace this le with prentcsmacro.sty for your meeting,

or with entcsmacro.sty for your meeting. Both can be found at the ENTCS Macro Home Page.

An Example Paper

My Name 1;2

My Department

My University

My City, My Country

My Co-author 3

My Co-author’s Department

My Co-author’s University

My Co-author’s City, My Co-author’s Country


This is a short example to show the basics of using the ENTCS style macro les. Ample examples of how les should look may be found among the published volumes of the series at the ENTCS Home Page Key words: Please list keywords from your paper here, separated by commas.

1 Introduction

This short note provides a guide to using the ENTCS macro package for preparing papers for publication in your conference Proceedings. The Pro- ceedings may be printed and hard copies distributed to participants at the meeting; this is an option to Conference Organizers may choose to exercise. The Proceedings also will be par of a volume in the series Electronic Notes in Theoretical Computer Science (ENTCS), which is published under the aus- pices of Elsevier Science B. V., the publishers of Theoretical Computer Science. It’s home page is The ENTCS macro package consists of two les:

entcs.cls, the basic style le, and

1 Thanks to everyone who should be thanked

2 Email:

3 Email:

2003 c Published by Elsevier Science B. V.

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entcsmacro.sty, a macro le containing the de nitions of some of the theorem- like environments and a few other tidbits.

The formatting these style les impose should not be altered { the reason for using them is to attain a uniform format for all papers in the Proceedings of which your paper is a part.

Additional macro les can be added using \usepackage The le entcsmacro.sty must be included in the list, as is done at the start of the source le for this paper.

The ENTCS package requires a relatively up-to-date LATEX system in order to be successfully used. This is re

ected in two other packages that are called by entcs.cls, which must be available on your machine. These are:

The hyperref package. This package allows the use of hyperlinks in les prepared using LATEX2e, one of the main features of Adobe’s Acrobat c Reader software. Be sure that you have at least version 6.69d of this pack- age.

The ifpdf package. This is used by hyperref to di erentiate between the use of pdfLATEX and LATEX2e, followed by dvips and then ps2pdf. The le instraut.dvi contains information about the use of LATEXto pre- pare les for online publication by Elsevier. This le refers to the older version of LATEX that is no longer suppported, and that is inadequate for preparing

.pdf les for online publication. Reading this le should answer most of the basic questions about LATEX that might arise.

2 Frontmatter

The biggest di erence between a \usual" LATEX style such as article.sty and the ENTCS package is that the ENTCS macro package requires the title, author’s name or names, abstract, keywords and \thanks" all to be included within the frontmatter environment. At the beginning of the source le for this paper, you’ll notice this. Also, you’ll notice that the usual \maketitle is absent; it no longer is needed. The ENTCS style package automatically generates the title, author’s name and address, and related material at the beginning of the paper. Note also that hyperref has been disabled in this part of the entcs.cls le, so references to footnotes aren’t linked to the appropriate footenotes or addresses. This is an old problem with LATEX, involving the fact that the references within the frontmatter aren’t passed cleanly to the linking software.

For those who have used the ENTCS package before, the one new thing to note is the inclusion of Keywords; these are now required by Elsevier { they’re also required by ACM’s Computing Reviews which reviews ENTCS publications.

The ENTCS macro package provides two alternatives to listing authors names and addresses. These are described in detail in the le instraut.dvi. 2

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Basically, listing each author and his or her address in turn, is the simplest method. But, if there are several authors and two or more share the same address (but not all authors are at this address), then the method of listing authors rst, and then the addresses, and of referencing addresses to authors should be used.

Also, notice that acknowledgment of support (the contents of \thanks) should be done by a separate listing of \thanks[NSF]{To the NSF} with the optional argument { [NSF] { being used for \thanksref which is attached to those authors acknowledging such support. It is important that the \thanks not be included within the scope of \author{} or of \title{}, but it must be within the scope of the environment frontmatter. More details about added terms such as \collab can be found in inst.dvi, if they are needed.

Also, notice that the command \lastname{My Lastname} has been in- cluded before the frontmatter begins. This command should contain the last names of the authors of the paper. If there are no more than three au- thors, then they should be listed with the word \and" between the last two; if more than three authors collaborated on the paper, then the rst author only should be listed, together with \emph{et al}. This command creates the headline for each page after page 1.

Finally, please be sure to include an abstract for your paper. 3 Sectioning and Environments

Since ENTCS is published through the auspices of Elsevier Science B. V., their style les have been used to create the ENTCS macro package. Here’s a proof that this package is not much di erent than most of the ones one encounters: De nition 3.1 A le is derived from another if it is obtained with only a few modi cations from the original le.

Theorem 3.2 The le entcs.cls is derived from elsart.sty. Proof. This is clear from the similarity of the output to the output from Elsevier’s style les. 2

If one wants to start a proof with a descriptive word, such as \sketch", then one can use the \begin{proof end{proof*} environment, as in Proof (Sketch) This can be derived from simple observations. 2 The main di erences between the le entcs.cls and the elsartr.cls le used by Elsevier are the more precise format we use { Elsevier’s generic les are meant for preliminary editing, and more precise formatting is imposed using a macro le designed for the speci c Elsevier journal in which the paper will eventually appear. The entcs.cls and entcsmacro.sty les format papers 3

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uniformly so that they all are easily recognizable as being from the series Electronic Notes in Theoretical Computer Science.

All of the usual features of LATEX are available with these style les { it is only the formatting that has been rigorously de ned. Thus, one has available the sectioning commands \section,\subsection, \paragraph and

\subparagraph. The numbering scheme used is one under which Theorem 1.2.3 is the third numbered item in second subsection of the rst section of the paper. In order to facilitate cross-references, all of the named environments given below are numbered, and all use the same number scheme. The le entcsmacro.sty contains additional information that is needed to typeset a paper. It also has the de nitions of the AMS euler and blackboard bold fonts builtin. If you want to use symbols for the natural numbers, the reals, etc., then we prefer that you use the blackboard bold fonts, and not plain bold fonts. This is accomplished by using the \mathbb font, as in N or R.

The names of theorem-like environments are provided in entcsmacro.sty. With the exception of the environment Algorithm, the names of all of these are full name, rather than a shortened version. The environments provided and their names are

\begin{theorem} ... \end{theorem} for Theorems,

\begin{lemma} ... \end{lemma} for Lemmas,

\begin{corollary} ... \end{corollary} for Corollaries,

\begin{proposition} ... \end{proposition} for Propositions,

\begin{criterion} ... \end{criterion} for Criteria,

\begin{alg} ... \end{alg} for Algorithms,

\begin{definition} ... \end{definition} for De nitions,

\begin{conjecture} ... \end{conjecture} for Conjectures,

\begin{example} ... \end{example} for Examples,

\begin{problem} ... \end{problem} for Problems,

\begin{remark} ... \end{remark} for Remarks,

\begin{note} ... \end{note} for Notes,

\begin{claim} ... \end{claim} for Claims,

\begin{summary} ... \end{summary} for Summary,

\begin{case} ... \end{case} for Cases, and

\begin{ack} ... \end{ack} for Acknowledgements.

For example,


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Algorithm 1 Step 1: Write the paper

Step 2: Format it with the ENTCS macro package

Step 3: Ship the whole thing to the Guest Editors

4 References and Cross-references

All the cross-referencing facilities of LATEX are supported, so one can use

\ref{} and \cite{} for cross-references within the paper and for references to bibliographic items. As is done in this note, the References section 6 can be composed with \begin{thebibliography end{thebibliography}. Alternatively, BibTEX can be used to compile the bibliography. Whichever one is used, the references are to be numbered consecutively, rather than by author-de ned acronyms. Of course you can use your own acronyms for easy reference to each of the items in the bibliography, as has been done with the listing for this short note.

However, note that the references should not be started with a new \section command.

The package hyperref is automatically loaded by entcs.cls, and this makes all the cross-references within the document \active" when the pdf le of the paper is viewed with Adobe’s Acrobat c Reader. The format for including a link is simple: simply insert \href{URL} {text} where URL is the URL to which you want the link to point, and text is the text you want to be highlighted, which when clicked upon will bring up the desired web page. 4.1 Particulars about .pdf les

We now require that .pdf les be provided for publication online. A .pdf le is viewable by Adobe’s Acrobat c viewer, which can be con gured to load automatically within a browser. Viewing a properly formatted .pdf le with Acrobat c allows the cross-references and links to URLs to be active. In fact, Elsevier utilizes .pdf les in order to take better advantage of the web’s ca- pabilities.

But one point we want to emphasize is that you should be sure to use Type 1 fonts when you typeset your LATEX source le. These fonts are scalable, meaning that they carry information that allows the devise viewing the nal output to scale the fonts to suit the viewer being used { from an onscreen viewer such as Adobe’s Acrobat c Reader, to printing the le on a printer. You can tell if you have used the right fonts by viewing the nal output on your machine. It the fonts look grainy, then you have not used Type 1 fonts. They can be located at the CTAN archive { they are public domain fonts, and don’t cost anything to add them to your system. Assuming you have Type 1 fonts available, then there are there methods for producing .pdf les.


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Using dvips and ps2pdf

We list this option rst since it appears to be the most reliable and the easiest to use, especially if you include embedded PostScript graphics (.eps les) in your source le. Simply run LATEX2e on your source le, then apply dvips to produce a PostScript le, and nally apply ps2pdf to obtain a .pdf le.

The DVIPDFM utility

Another easy method for producing acceptable .pdf les is via the utility dvipdfm. This utility is included in distributions of MikTEX, which runs on Windows machines, but it probably needs to be added to your teTEX distribution, if you are running LATEX on a UNIX machine. The utility and precise information about installing it on your system can be found at the web page In essence, this utility converts a .dvi le into a .pdf le. So, one can rst prepare the .dvi le using LATEX, and then apply the utility dvipdfm to produce the needed .pdf le. 4 This utility makes inclusion of graphics particularly simple { those that are included in the LATEX source le are simply converted to the .pdf format. As we note below, things are not so simple with the second alternative, which is to use pdfLATEX.


An alternative to the rst possibilities to produce .pdf les is to process the source le with pdfLATEX. This format is available from the standard CTAN sites It appears that pdfLATEX and hyperref have some problems when used together. It is necessary to use pdfLATEX version 14d or later in order to minimize these issues. If your system has an earlier version (most teTEX distributions have version 13d), then you can update your system by retrieving the latest version of pdfLATEX from Even if the recent versions are used, pdfLATEX has the same dealing with references em- bedded with the frontmatter section described above for LATEX. But there is one aspect of pdfLATEX that creates problems. Many authors include EPS 5 les within their papers. While this is fairly straightforward with LATEX, there are a couple of points to note when attempting this with pdfLATEX.

To include a PostScript image in a .pdf le produced with pdfLATEX, you rst have to convert the image to a .pdf le, and then it can be in- cluded using the same command sequence as above. The conversion can be 4 Beware! The utility dvipdf does not produce acceptable .pdf les, and should not be used. Only dvipdfm should be used to produce .pdf les. 5 EPS stands for embedded PostScript, which a ords a mechanism for including pre- prepared PostScript les within a LATEX document.


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accomplished most easily using Ghostscript; you can simply view the le in Ghostview and then print the image to a .pdf le using the pdfwriter option within Ghostview. The result for a standard chess board that is part of the Ghostview distribution is the following image:

Here as well is a copy of a color image. While pdfLATEX can handle image les in other formats, LATEX can only handle .eps images reliably. It also should be noted that we have included two separate source les for this example le { one for LATEX and one for pdfLATEX { because we want 7

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to illustrate how to insert graphics images into the le. If your paper does not include such images, then the same source le can be formatted by either LATEX orf by pdfLATEX.

Using ENTCS Macros with Mac OS X

Of course, if your le doesn’t require .eps or other PostScript les, then you can create the required .pdf le using any of the standard TEX imple- mentations for the Macintosh. If you need to include PostScript les, and if you are using TEXShop, then you can specify to use dvips and ghostview in processing your le, and then you can apply ps2pdf to create the needed .pdf le. Alternatibely, the Mac OS X operating system is based on UNIX, so it supports the use of teTEX as described above.

5 Summary

The ENTCS macro package is relatively easy to use and provides a uniform layout for all the papers that appear in ENTCS.

Problem 5.1 Finish your paper and get it to your Program Chairman on time!

When you have nished preparing your paper, send a copy of the source le, together with any macro les that are needed to your Program Chairman. If the les are extensive, you can place copies in the pub/incoming sub-directory of the ftp directory on the machine indicated by your Program Chairman using anonymous ftp. If you do this, please send me email to alert me that the le(s) are here.

Assigning Volume / Issue Numbers

One additional point worth mentioning is that ENTCS is moving to Sci- enceDirect, Elsevier’s main platform for publishing electronic series, Because ScienceDirect must publish entire volumes at the same time, we have changed the procedure for preparing nal versions so that volume numbers will not be assigned until the nal versions are ready. Guest Editors will now have to receive the nal version of all papers in their Proceedings before a volume and issue number will be assigned for the Proceedings. Even with the move to ScienceDirect, the reference scheme already used for publications in ENTCS { http://www.elsevier/nl/locate/entcs/ NNnn.html remains the valid way to cite papers published in ENTCS, where NN denotes the number of the vol- ume, and nn denotes the issue number. Publications consisting of an entire volume should use 1 as the issue number.

Copyright Transfer Forms

One result of the move to ScienceDirect is that the corresponding author of each paper published in ENTCS must submit a signed Copyright Transfer 8

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Form to Elsevier in order for their paper to be published. A copy of this form will be sent to each author by the Guest Editors of each volume. Details about this agreement specifying the rights of the authors and the rights of Elsevier are available at Elsevier’s Author Gateway.

Publication of Final Versions

Because ScienceDirect cannot easily accommodate changes to published material, the Proceedings in its entirety must be ready before it can be pub- lished. This is one reason why the volume and issue number is not assigned until the nal versions of all papers have been sent to the Guest Editors for nal processing.

6 Bibliographical references

ENTCS employs the plain style of bibliographic references in which references are listed in alphabetical order, according the the rst author’s last name, and are sequentially numbered. Please utilize this style. We have a BibTEX style le, for those who wish to use it. It is the le entcs.bst which is included in this package. The basic rules we have employed are the following:

Authors’ names should be listed in alphabetical order, with the rst author’s last name being the rst listing, followed by the author’s initials or rst name, and with the other authors names listed as rst name, last name.

Titles of articles in journals should be in emphasized type.

Titles of books, monographs, etc. should be in quotations.

Journal names should be in plain roman type.

Journal volume numbers should be in boldface type, with the year of pub- lication immediately following in roman type, and enclosed in parentheses.

References to URLs on the net should be \active" and the URL itself should be in typewriter font.

Articles should include page numbers.

The criteria are illustrated in the following.


[1] Civin, P., and B. Yood, Involutions on Banach algebras, Paci c J. Math. 9

(1959), 415{436.

[2] Cli ord, A. H., and G. B. Preston, \The Algebraic Theory of Semigroups," Math. Surveys 7, Amer. Math. Soc., Providence, R.I., 1961.

[3] Freyd, Peter, Peter O’Hearn, John Power, Robert Tennent and Makoto Takeyama, Bire

ectivity, Electronic Notes in Theoretical Computer Science 1

(1995), URL: 9

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[4] Easdown, D., and W. D. Munn, Trace functions on inverse semigroup algebras, U. of Glasgow, Dept. of Math., preprint 93/52.

[5] Roscoe, A. W., \The Theory and Practice of Concurrency," Prentice Hall Series in Computer Science, Prentice Hall Publishers, London, New York (1198), 565pp. With associated web site

[6] Shehadah, A. A., \Embedding theorems for semigroups with involution, \ Ph.D. thesis, Purdue University, Indiana, 1982.

[7] Weyl, H., \The Classical Groups," 2nd Ed., Princeton U. Press, Princeton, N.J., 1946.


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