/usr/share/axiom-20170501/src/algebra/VARIABLE.spad is in axiom-source 20170501-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | )abbrev domain VARIABLE Variable
++ Author: Mark Botch
++ Description:
++ This domain implements variables
Variable(sym) : SIG == CODE where
sym : Symbol
SIG ==> Join(SetCategory, CoercibleTo Symbol) with
coerce : % -> Symbol
++ coerce(x) returns the symbol
variable: () -> Symbol
++ variable() returns the symbol
CODE ==> add
coerce(x:%):Symbol == sym
coerce(x:%):OutputForm == sym::OutputForm
variable() == sym
x = y == true
latex(x:%):String == latex sym
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