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**To**:*vieth@thphy.uni-duesseldorf.de (Ulrik Vieth)***Subject**:**Re: more on a Times/Symbol implementation of MC/MSP****From**:*"Denis B. Roegel" <Denis.Roegel@loria.fr>***Date**: Fri, 10 Oct 1997 15:41:24 +0200 (MET DST)**Cc**:*clasen@pong.mathematik.uni-freiburg.de, math-font-discuss@cogs.susx.ac.uk*

`Ulrik Vieth' wrote > > P.S. Still another question: Should the \backepsilon be included > in both upright and italics greek? I'm unfamilar with who uses > this symbol and what for. (Adobe Symbol calls it `suchthat'.) It was used in set theory, but only a long time ago, as far as I know. \backepsilon was introduced by Peano (see Peano, The principles of arithmetic, presented by a new method (1889), originally in latin, translated in english in Jean Van Heijenoort, From Frege to Goedel, 1967, page 90.) Peano gives as example \backepsilon < y to mean "the x's such that x<y". Some more modern writers, such as Quine, write x \backepsilon x < y for the previous example. Denis P.-S. I forwarded this to the mathfont list, but I am not sure it goes through. Please forward it if necessary.

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