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
28
|
\DOC INT_ABS_CONV
\TYPE {INT_ABS_CONV : conv}
\SYNOPSIS
Conversion to produce absolute value of an integer literal of type {:int}.
\DESCRIBE
The call {INT_ABS_CONV `abs c`}, where {c} is an integer literal of type
{:int}, returns the theorem {|- abs c = d} where {d} is the canonical integer
literal that is equal to {c}'s absolute value. The literal {c} may be of the
form {&n} or {-- &n} (with nonzero {n} in the latter case) and the result will
be of the same form.
\FAILURE
Fails if applied to a term that is not the negation of one of the permitted
forms of integer literal of type {:int}.
\EXAMPLE
{
# INT_ABS_CONV `abs(-- &42)`;;
val it : thm = |- abs (-- &42) = &42
}
\SEEALSO
INT_REDUCE_CONV, REAL_RAT_ABS_CONV.
\ENDDOC
|
