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In eqn(1), shouldn't a brace be in roman?

From: G. Branden Robinson
Subject: In eqn(1), shouldn't a brace be in roman?
Date: Tue, 16 Nov 2021 10:49:24 +1100
User-agent: NeoMutt/20180716

Hi folks,

Given this input:

S = "{" x | x \[mo] Z, x > pi "}"

The braces show up in italics in the output (using groff 1.22.4, "groff
-e -ms").  Isn't that wrong?

K&C say:

  Variables are made italic, operators and digits become roman,
  and normal spacings between letters and operators are altered slightly
  to give a more pleasing appearance.[1]


[1] Kernighan & Cherry; "A System for Typesetting Mathematics"; _Unix
Programmer's Manual, Seventh Edition, "Revised and Expanded Version",
Volume 2 (1983); ยง4, p. 140.

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