falsity。Thisisalsowhyitusedtobesaidthatwemustassume
somethingthatisfalse，asgeometersassumethelinewhichisnota
footlongtobeafootlong。Butthiscannotbeso。Forneitherdo
geometersassumeanythingfalsefortheenunciationisextraneous
totheinference，norisitnon-beinginthissensethatthethings