is_exists1

boolSyntax.is_exists1 : term -> bool

Tests a term to see if it is a unique existence term.

If M has the form ?!v. t then is_exists1 M returns true. If the term is not a unique existence quantification the result is false.

Failure

Never fails.

See also

boolSyntax.mk_exists1, boolSyntax.dest_exists