REAL_INT_NEG_CONV : conv

SYNOPSIS

Conversion to negate an integer literal of type :real.

DESCRIPTION

The call REAL_INT_NEG_CONV `--c`, where c is an integer literal of type :real, returns the theorem |- --c = d where d is the canonical integer literal that is equal to c's negation. 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 CONDITIONS

Fails if applied to a term that is not the negation of one of the permitted forms of integer literal of type :real.

EXAMPLE

  # REAL_INT_NEG_CONV `-- (-- &3 / &2)`;;
  val it : thm = |- --(-- &3 / &2) = &3 / &2

COMMENTS

The related function REAL_RAT_NEG_CONV subsumes this functionality, also applying to rational literals. Unless the restriction to integers is desired or a tiny efficiency difference matters, it should be used in preference.