[OS X TeX] Latex symbol for "define equal"

juan tolosa juantolo at me.com
Tue Aug 21 23:08:50 CEST 2018 

I will limit myself to answer your question, since this discussion belongs somewhere else:
VERY simple: Write “Definition” before the statement, or “Theorem”, depending on what you mean.

> On Aug 21, 2018, at 7:02 AM, Markus Klyver <markusklyver at hotmail.com> wrote:
> 
> But how would the reader know if it's a theorem or a definition? Consider the statement "f(x)=1 when x=2". Do we mean f(x)=1 <---> x=2 or just f(x)=1 <--- x=2?
> 
> 
> Från: MacOSX-TeX <macosx-tex-bounces at email.esm.psu.edu <mailto:macosx-tex-bounces at email.esm.psu.edu>> för Josep Maria Font <jmfont at ub.edu <mailto:jmfont at ub.edu>>
> Skickat: den 21 augusti 2018 12:15
> Till: TeX on Mac OS X Mailing List
> Ämne: Re: [OS X TeX] Latex symbol for "define equal"
>  
> That's why I prefer to use "when" for definitions: [...this NEW thing happens...] WHEN [...such-and-such known, understandable condition holds...].
> 
> 
> JMaF
> 
> 
> > El 21 /08/18, a les 5:40, juan tolosa <juantolo at me.com> va escriure:
> >
> > This is tangential but, since we are at it, what really, really annoys me, is the tendency in some books to define concepts using “if and only if” instead of plain “if”, as in
> >
> > Definition. A sequence (a_n) converges to a real number p if and only if for every epsilon > 0 there is an N such that (etc.)
> >
> > (Is it my impression, or there is a growing number of such texts? And when did this nonsense begin?)
> >
> > One could simply agree that the “if” in definitions is not the same as the “if” in logical statements.
> > If one is really fastidious, one could put a statement at the beginning of the book that “if” in definitions can be reworded as, say,
> > by “(a_n) converges to p” we mean … (etc)
> > Or simply not use “if” at all in definitions.
> > What is even more annoying is that when the definition gets really involved, the “if and only if” makes it even worse.
> > And, invariably, in a really involved definition you will find that the author(s) abandon their own fastidiousness and just use “if.”
> > Question is, why not do it from the very beginning?
> >
> > Juan
> >
> >> On Aug 20, 2018, at 7:56 PM, Markus Klyver <markusklyver at hotmail.com> wrote:
> >>
> >> Really, there's no standardized notation for it. Just be consistent and use the most aesthetically pleasing and practical notation on your context. Maybe := looks ugly will your fonts. Use an other notation instead.
> >> ----------- Please Consult the Following Before Posting -----------
> >> TeX FAQ: http://www.tex.ac.uk/faq <http://www.tex.ac.uk/faq>
> >> List Reminders and Etiquette: https://sites.esm.psu.edu/~gray/tex/ <https://sites.esm.psu.edu/~gray/tex/>
> >> List Archives: http://dir.gmane.org/gmane.comp.tex.macosx <http://dir.gmane.org/gmane.comp.tex.macosx>
> >>               https://email.esm.psu.edu/pipermail/macosx-tex/ <https://email.esm.psu.edu/pipermail/macosx-tex/>
> >> TeX on Mac OS X Website: http://mactex-wiki.tug.org/ <http://mactex-wiki.tug.org/>
> >> List Info: https://email.esm.psu.edu/mailman/listinfo/macosx-tex <https://email.esm.psu.edu/mailman/listinfo/macosx-tex>
> >
> > ----------- Please Consult the Following Before Posting -----------
> > TeX FAQ: http://www.tex.ac.uk/faq <http://www.tex.ac.uk/faq>
> > List Reminders and Etiquette: https://sites.esm.psu.edu/~gray/tex/ <https://sites.esm.psu.edu/~gray/tex/>
> > List Archives: http://dir.gmane.org/gmane.comp.tex.macosx <http://dir.gmane.org/gmane.comp.tex.macosx>
> >                https://email.esm.psu.edu/pipermail/macosx-tex/ <https://email.esm.psu.edu/pipermail/macosx-tex/>
> > TeX on Mac OS X Website: http://mactex-wiki.tug.org/ <http://mactex-wiki.tug.org/>
> > List Info: https://email.esm.psu.edu/mailman/listinfo/macosx-tex <https://email.esm.psu.edu/mailman/listinfo/macosx-tex>
> 
> 
> 
> Aquest missatge, i els fitxers adjunts que hi pugui haver, pot contenir informació confidencial o protegida legalment i s’adreça exclusivament a la persona o entitat destinatària. Si no consteu com a destinatari final o no teniu l’encàrrec de rebre’l, no esteu autoritzat a llegir-lo, retenir-lo, modificar-lo, distribuir-lo, copiar-lo ni a revelar-ne el contingut. Si l’heu rebut per error, informeu-ne el remitent i elimineu del sistema tant el missatge com els fitxers adjunts que hi pugui haver.
> 
> Este mensaje, y los ficheros adjuntos que pueda incluir, puede contener información confidencial o legalmente protegida y está exclusivamente dirigido a la persona o entidad destinataria. Si usted no consta como destinatario final ni es la persona encargada de recibirlo, no está autorizado a leerlo, retenerlo, modificarlo, distribuirlo o copiarlo, ni a revelar su contenido. Si lo ha recibido por error, informe de ello al remitente y elimine del sistema tanto el mensaje como los ficheros adjuntos que pueda contener.
> 
> This email message and any attachments it carries may contain confidential or legally protected material and are intended solely for the individual or organization to whom they are addressed. If you are not the intended recipient of this message or the person responsible for processing it, then you are not authorized to read, save, modify, send, copy or disclose any part of it. If you have received the message by mistake, please inform the sender of this and eliminate the message and any attachments it carries from your account.
> ----------- Please Consult the Following Before Posting -----------
> TeX FAQ: http://www.tex.ac.uk/faq <http://www.tex.ac.uk/faq>
> List Reminders and Etiquette: https://sites.esm.psu.edu/~gray/tex/ <https://sites.esm.psu.edu/~gray/tex/>
> List Archives: http://dir.gmane.org/gmane.comp.tex.macosx <http://dir.gmane.org/gmane.comp.tex.macosx>
>                 https://email.esm.psu.edu/pipermail/macosx-tex/ <https://email.esm.psu.edu/pipermail/macosx-tex/>
> TeX on Mac OS X Website: http://mactex-wiki.tug.org/ <http://mactex-wiki.tug.org/>
> List Info: https://email.esm.psu.edu/mailman/listinfo/macosx-tex <https://email.esm.psu.edu/mailman/listinfo/macosx-tex>
> ----------- Please Consult the Following Before Posting -----------
> TeX FAQ: http://www.tex.ac.uk/faq <http://www.tex.ac.uk/faq>
> List Reminders and Etiquette: https://sites.esm.psu.edu/~gray/tex/ <https://sites.esm.psu.edu/~gray/tex/>
> List Archives: http://dir.gmane.org/gmane.comp.tex.macosx <http://dir.gmane.org/gmane.comp.tex.macosx>
>                https://email.esm.psu.edu/pipermail/macosx-tex/ <https://email.esm.psu.edu/pipermail/macosx-tex/>
> TeX on Mac OS X Website: http://mactex-wiki.tug.org/ <http://mactex-wiki.tug.org/>
> List Info: https://email.esm.psu.edu/mailman/listinfo/macosx-tex <https://email.esm.psu.edu/mailman/listinfo/macosx-tex>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://tug.org/pipermail/macostex-archives/attachments/20180821/a04549fe/attachment-0001.html>
-------------- next part --------------
----------- Please Consult the Following Before Posting -----------
TeX FAQ: http://www.tex.ac.uk/faq
List Reminders and Etiquette: https://sites.esm.psu.edu/~gray/tex/
List Archives: http://dir.gmane.org/gmane.comp.tex.macosx
                https://email.esm.psu.edu/pipermail/macosx-tex/
TeX on Mac OS X Website: http://mactex-wiki.tug.org/
List Info: https://email.esm.psu.edu/mailman/listinfo/macosx-tex

More information about the macostex-archives mailing list