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is_res_exists                                          (res_quanTools)
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is_res_exists : (term -> bool)

SYNOPSIS
Tests a term to see if it is a restricted existential quantification.

DESCRIBE
{is_res_exists "?var::P. t"} returns {true}. If the term is not a
restricted existential quantification the result is {false}.

FAILURE
Never fails.

SEEALSO
res_quanTools.mk_res_exists, res_quanTools.dest_res_exists.

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