A Treatise on Logic: Or, The Laws of Pure Thought; Comprising Both the Aristotelic and Hamiltonian Analyses of Logical Forms, and Some Chapters of Applied LogicSever and Francis, 1864 - 450 էջ |
From inside the book
Արդյունքներ 50–ի 1-ից 5-ը:
Էջ 9
... reference to which we classify them . It is evident that Concepts must be much clearer repre- sentations of things than the confused aggregate of Percepts or Intuitions on which they are founded . With their light they irradiate and ...
... reference to which we classify them . It is evident that Concepts must be much clearer repre- sentations of things than the confused aggregate of Percepts or Intuitions on which they are founded . With their light they irradiate and ...
Էջ 34
... reference to the standard forms the validity of which they presuppose , and which they endeavor , as it were , to approximate . Universal Logic considers the Laws of Thought in their application , not to this or that special class of 34 ...
... reference to the standard forms the validity of which they presuppose , and which they endeavor , as it were , to approximate . Universal Logic considers the Laws of Thought in their application , not to this or that special class of 34 ...
Էջ 38
... reference to those mistakes in thinking which proceed from an incautious use of words . The utility of the study of Logic — at least , of Formal Logic - has been , perhaps , more generally doubted or de- nied , during the last two or ...
... reference to those mistakes in thinking which proceed from an incautious use of words . The utility of the study of Logic — at least , of Formal Logic - has been , perhaps , more generally doubted or de- nied , during the last two or ...
Էջ 53
... reference at least to synthetic Judg- ments , that all Thought should be consequent ; that is , that it should never affirm or deny a union of two Concepts without any ground for such affirmation or denial . The sufficiency of this ...
... reference at least to synthetic Judg- ments , that all Thought should be consequent ; that is , that it should never affirm or deny a union of two Concepts without any ground for such affirmation or denial . The sufficiency of this ...
Էջ 64
... reference to the ob- jects or things which it denotes , it is a Mark ; but if used as a Class - notion of certain objects , and with only second- ary reference to the attributes or qualities involved in it , it is a Concept in the ...
... reference to the ob- jects or things which it denotes , it is a Mark ; but if used as a Class - notion of certain objects , and with only second- ary reference to the attributes or qualities involved in it , it is a Concept in the ...
Այլ խմբագրություններ - View all
A Treatise on Logic: Or, The Laws of Pure Thought; Comprising Both the ... Francis Bowen Ամբողջությամբ դիտվող - 1864 |
A Treatise on Logic: Or, The Laws of Pure Thought; Comprising Both the ... Francis Bowen Ամբողջությամբ դիտվող - 1895 |
Common terms and phrases
absolutely actually affirm the Consequent Affirmative already animal antecedent applied Aristotelic doctrine Aristotle assertion attributes Axiom called Cause class of things classification conceived Concept Conclusion connoted Consequent considered Contradictory Contraposition Conversion Copula Definition Demonstrative denote deny determined Disjunctive Disjunctive Syllogism distinct enounced Enthymeme equal event evidence Excluded exists explicated expressed Extension fact faculty Fallacy false Figure former Genus gism Hamilton Hence Immediate Inference individual Induction Inductive Reasoning infinite instance Intension Intuition knowledge language Laws of Thought Logic logicians Major Premise Marks Matter meaning ment merely Middle Term mind mode Modus tollens Moods nature necessary Negative not-X notion objects observed particular peculiar perception Predicate principle properly Proposition proved Pure Thought qualities Quantity rational reasoning reduced relation respect Rule sion Sir William Hamilton sophism Species Subalternation Subject sublating Sumption Syllogism tion tive true truth Universal valid whole words
Սիրված հատվածներ
Էջ 423 - Intuitions can be now known to us only by an act of remembrance ; and as the strength of a chain is the strength of its weakest link...
Էջ 392 - It consists in ascribing the character of general truths to all propositions which are true in every instance that we happen to know of.
Էջ 24 - And a little attention will discover that it is not necessary (even in the strictest reasonings) that significant names which stand for ideas should, every time they are used, excite in the understanding the ideas they are made to stand for : in reading and discoursing, names being for the most part used as letters are in Algebra...
Էջ 297 - Englishmen or not-Englishmen,' to the exclusion of the third possibility of a mixed force, so it is false to say, ' Every body must move in the place where it is, or in the place where it is not,' to the exclusion of the third possibility of moving partly in the one and partly in the other.
Էջ 444 - were to determine to play for their whole property, what would be the effect of this agreement? The one would only double his fortune, and the other reduce his to naught. What proportion is there between the loss and the gain? The same that there is between all and nothing. The gain of the one is but a moderate sum, — the loss of the other is numerically infinite, and morally so great that the labour of his whole life may not perhaps suffice to restore his property.
Էջ 392 - ... apprehension. If, then, the processes which bring these cases within the same category with the rest require that we should assume the universality of the very law which they do not at first sight appear to exemplify, is not this a petitio principii? Can we prove a proposition by an argument which takes it for granted? And if not so proved, on what evidence does it rest?
Էջ 392 - To an inhabitant of Central Africa, fifty years ago, no fact probably appeared to rest on more uniform experience than this, that all human beings are black. To Europeans, not many years ago, the proposition, All swans are white, appeared an equally unequivocal instance of uniformity in the course of nature. Further experience has proved to both that they were mistaken; but they had to wait fifty centuries for this experience.
Էջ 290 - ... 2. None but Whites are civilized : the ancient Germans were Whites : therefore they were civilized. 3. None but Whites are civilized : the Hindoos are not Whites : therefore they are not civilized. 4. None but civilized people are Whites : the Gauls were Whites : therefore they were civilized. 5. No one is rich who has not enough : no miser has enough : therefore no miser is rich. 6. If penal laws against Papists were , enforced, they would be aggrieved : but penal laws against them are not enforced...
Էջ 23 - Words are the fortresses of thought. They enable us to realize our dominion over what we have already overrun in thought, — to make every intellectual conquest the basis of operations for others still beyond. Or another illustration : You have all heard of the process of tunnelling, of tunnelling through a sand-bank. In this operation it is impossible to succeed unless every foot — nay, almost every inch — in our progress be secured by an arch of masonry, before we attempt the excavation of...
Էջ 150 - Mathematics. so denominated, and thought proper, we have seen, is the cognition of one object of thought by another, in or under which it is mentally included ; in other words, thought is the knowledge of a thing through a concept or general notion, or of one notion through another.