Ross, G. R. T., [280].
Schröder, Der Operationskreis des Logikkalkuls, [471] n. ; [472] n. ; [473]; [475]; [511]; [534].
Secondary Opposition, [115].
Secondary Quantification, [105]; [116].
Self-contradiction, [457].
Sextus Empiricus, [424]; [426].
Shyreswood, W., [329] n.
Sigwart, on empirical, metaphysical, and logical concepts, [27], 8; on the names of ultimate elements, [34]; on apparently tautologous propositions, [52] n. ; on negative names, [57]–60; on the reference to time in judgments, [77]; on compound judgments, [82] n., [83] n. ; on modality, [86], 7; on universal judgments, [99] n. ; on negative judgments, [120] n. ; on the grounds of denial, [121]; [128] n. ; on contraposition, [136]; [234] n. ; on hypotheticals, [264], 5; on figures 2 and 3 of the syllogism, [366] n. ; [349]; on the value of the syllogism, [427] n., [428] n. ; on the laws of thought, [451]; on the law of identity, [461], 2; on the law of contradiction, [455]; on the law of excluded middle and the law of twofold negation, [459], 60.
Simple Constructive Dilemma, [364].
Simple Contraposition, [136].