NOT_EQ_SYM : (thm -> thm)

SYNOPSIS
Swaps left-hand and right-hand sides of a negated equation.

DESCRIBE
When applied to a theorem A |- ~(t1 = t2), the inference rule NOT_EQ_SYM returns the theorem A |- ~(t2 = t1).
    A |- ~(t1 = t2)
   -----------------  NOT_EQ_SYM
    A |- ~(t2 = t1)

FAILURE
Fails unless the theorem's conclusion is a negated equation.

SEEALSO  DEPTH_CONV,   REFL,   SYM

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