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Quote by Bertrand Russell

“Frege has the merit of ... finding a third assertion by recognising the world of logic which is neither mental nor physical.”

Book:Our Knowledge of the External World

Work

Our Knowledge of the External World

This book delves into the fundamental questions of epistemology, examining how humans perceive and understand the external world. It investigates the reliability of human senses and the possibility of objective knowledge, offering a comprehensive analysis of the philosophical underpinnings of our understanding of reality. more

Author

Bertrand Russell

Bertrand Russell was a British philosopher, mathematician, and logician born on May 18, 1872, and died on February 2, 1970. He is known for his contributions to logic and mathematics, particularly in the fields of mathematical logic and philosophical analysis. His works spanned a wide range of subjects, including ethics, political philosophy, history, and literary criticism. more

“I end with a word on the new symbols which I have employed. Most writers on logic strongly object to all symbols. ... I should advise the reader not to make up his mind on this point until he has well weighed two facts which nobody disputes, both separately and in connexion. First, logic is the only science which has made no progress since the revival of letters; secondly, logic is the only science which has produced no growth of symbols.”

Should Mind Firsts Wells Made Two Ends Facts Growth Progress Objects Reader Letters Logic Symbols Employed Disputes Advise Revival Connexion

Book:Syllabus of a Proposed System of Logic

Source: Syllabus of a Proposed System of Logic

“If you plan it out, and it seems logical to you, then you can do it. I discovered the power of a plan.”

Ifs Seems Can Do Plans Logic Logical You Can Do It

Author:Robert Ballard

“In every enterprise ... the mind is always reasoning, and, even when we seem to act without a motive, an instinctive logic still directs the mind. Only we are not aware of it, because we begin by reasoning before we know or say that we are reasoning, just as we begin by speaking before we observe that we are speaking, and just as we begin by seeing and hearing before we know what we see or what we hear.”

Knows Mind Stills Seems Science Seeing Logic Hearing Motive Reasoning Enterprise

Author:Claude Bernard

“It is evidently equally foolish to accept probable reasoning from a mathematician and to demand from a rhetorician demonstrative proofs.”

Science Accepting Demand Logic Proof Foolish Reasoning Mathematician Nicomachean Ethics

Book:The Nicomachean ethics

Source: The Nicomachean ethics

“It is time, therefore, to abandon the superstition that natural science cannot be regarded as logically respectable until philosophers have solved the problem of induction. The problem of induction is, roughly speaking, the problem of finding a way to prove that certain empirical generalizations which are derived from past experience will hold good also in the future.”

Way Problem Past Certain Natural Prove Findings Logic Philosopher Abandon Superstitions Respectable Natural Science Generalization Past Experiences

Author:A.J. Ayer

“It must be granted that in every syllogism, considered as an argument to prove the conclusion, there is a petitio principii. When we say, All men are mortal Socrates is a man therefore Socrates is mortal; it is unanswerably urged by the adversaries of the syllogistic theory, that the proposition, Socrates is mortal.”

Men Theory Prove Argument Logic Conclusion Mortals Granted Propositions Adversaries

Book:A System of Logic, Ratiocinative and Inductive: Being a Connected View of the Principles of Evidence, and the Methods of Scientific Investigation

Source: A System of Logic, Ratiocinative and Inductive: Being a Connected View of the Principles of Evidence, and the Methods of Scientific Investigation

“It really is worth the trouble to invent a new symbol if we can thus remove not a few logical difficulties and ensure the rigour of the proofs. But many mathematicians seem to have so little feeling for logical purity and accuracy that they will use a word to mean three or four different things, sooner than make the frightful decision to invent a new word.”