is_res_exists_unique
res_quanLib.is_res_exists_unique : term -> bool
Tests a term to see if it is a restricted unique existential quantification.
is_res_exists_unique "?!var::P. t" returns true. If the term is not
a restricted unique existential quantification the result is false.
Failure
Never fails.
See also
res_quanLib.mk_res_exists_unique,
res_quanLib.dest_res_exists_unique