 Gentzens notation definitely assimilates denial to assertion of negation, but might not quite have a single logical quality, see below.Logicians in the western traditions have often expressed belief in some other logical quality besides affirmation and denial.Sextus Empiricus, in the 2nd or 3rd century CE, argued for the existence of "nonassertive" statements, which indicate suspension of judgment by refusing to affirm or deny anything.