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Re: How to save a file with embedded unicode maths symbols

From: Pieter van Oostrum
Subject: Re: How to save a file with embedded unicode maths symbols
Date: Mon, 09 Mar 2020 17:27:21 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.90 (darwin)

Angus Comber <> writes:

> On Monday, March 9, 2020 at 1:19:16 PM UTC, Pieter van Oostrum wrote:
>> Angus Comber <***@**.c*> writes:
>> > If I go to this page: 
>> >
>> >
>> > There is a definition of the principle Let Φ(x) ... and I can paste that
>> > into emacs on Windows and I see the greek symbol displayed just fine.
>> >
>> > But When I go to save the file it prompts for a coding system (1st entry
>> > in list being chinese-iso-8bit). What coding system would I choose to be
>> > able to save the symbol to disk. My operating system is 64 bit Windows
>> > 7.
>> You can save in any encoding that is able to encode all the characters
>> in the file. But generally the best (most useful, universal) encoding
>> is utf-8.
>> However it depends on what you want to do afterwards with the file.
>> The programs that you use to process the file must be able to
>> understand that encoding. Nowadays most software understands utf-8.
>> -- 
>> Pieter van Oostrum
>> www: http://pieter.
>> PGP key: [8DAE142BE17999C4]
> If I save as filename LSP.txt and select utf-8 it saves without
> complaining but when I open the file again I see:
> Let Φ(x) be a property provable about objects x of type T. Then Φ(y)
> should be true for objects y of type S where S is a subtype of T.
> ie the phi has transformed to Φ.
Did you open it in Emacs?
What you see is the utf-8 encoding of Φ interpreted on reading as latin-1 
(iso-8859-1) or a similar encoding, like Windows-1252. Is your Emacs configured 
to prefer one of these encodings?

Pieter van Oostrum
PGP key: [8DAE142BE17999C4]

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