Studies and Exercises in Formal Logic: Including a Generalisation of Logical Processes in Their Application to Complex InferencesMacmillan & Company, limited, 1928 - 548 Seiten |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
abstract name affirmative Analytic propositions angles apodeictic assertion assertoric attributes called categorical propositions cloven-hoofed comprehension concept connexion connotation connotation and denotation considered contradictory contraposition contrary conversion copula denial denotation deny determined diagrams discussion disjunctive distinction distinguished distributed doctrine Dr Venn equivalent example exclusive existential import expressed extensive definition false formal logic given proposition Hence hypothetical immediate inference implying the existence included individual interpreted inverse involved Jevons judgment logic of relatives logicians meaning modality negative name not-A not-P not-S objects obversion ordinary original proposition pair particular proposition point of view position possible predicate premisses proper names propositional forms qualities question real proposition recognised reference regarded relation S'aP S'oP schedule of propositions sense shew shewn Sigwart singular names square of opposition statement subaltern subcontrary subject and predicate subjective intension syllogism symbols things tion triangle true truth universal proposition universe of discourse validity verbal proposition
Beliebte Passagen
Seite 437 - My cousin Westmoreland ! No, my fair cousin : If we are mark'd to die, we are enow To do our country loss ; and if to live, The fewer men, the greater share of honour.
Seite 417 - If a straight line meet two straight lines so as to make the two interior angles on the same side of it, taken together, less than two right angles...
Seite 295 - The old rules of logic informed us that from two negative premises no conclusion could be drawn, but it is a fact that the rule in this bare form does not hold universally true ; and I am not aware that any precise explanation has been given of the conditions under which it is or is not imperative. Consider the following example — Whatever is not metallic is not capable of powerful magnetic influence, (i) Carbon is not metallic, (2) Therefore, carbon is not capable of powerful magnetic influence.
Seite 434 - For those who are bent on cultivating their minds by diligent study, the incitement of academical honours is unnecessary; and it is ineffectual, for the idle, and such as are indifferent to mental improvement: therefore the incitement of academical honours is either unnecessary or ineffectual.
Seite 433 - Testimony is a kind of evidence which is very likely to be false : the evidence on which most men believe that there are pyramids in Egypt is testimony : therefore the evidence on which most men believe that there are pyramids in Egypt is very likely to ba false.
Seite 150 - A is greater than B ; therefore B is lefs than A. Thefe are converfions which, as far as I know, do not fall within any rule in logic ; nor do we find any lofs for want of a rule in fuch cafes.
Seite 198 - I have already made to every reader's consciousness : Does he, when he judges that all oxen ruminate, advert even in the minutest degree to the question, whether there is anything else which ruminates? Is this consideration at all in his thoughts, any more than any other consideration foreign to the immediate subject ? One person may know that there are other ruminating animals, another may think that there are none, a third may be without any opinion on the subject: but if they...
Seite 140 - It is in the assumption of the existence of the contradictory of the original predicate that an explanation of the apparent anomaly may be found. That assumption may be expressed in the form, 'Some things are not P'. The conclusion 'Some not-S is not P...
Seite 40 - A nonconnotative term is one which signifies a subject only, or an attribute only. A connotative term is one which denotes a subject, and implies an attribute.
Seite 202 - What worst relation of subject and predicate, subsists between either of two terms and a common third term, with which one, at least, is positively related ; — that relation subsists between the two terms themselves...