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If the additive inverse of a is zero, a itself is zero
cnf(additive_inverse_equals_additive_identity_2,negated_conjecture,
( equalish(additive_inverse(a),additive_identity) )).
cnf(a_not_equal_to_additive_identity_3,negated_conjecture,
( ~ equalish(a,additive_identity) )).
$false(by SPASS 3.5)
$false(by EP 1.1)
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