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Logic
November 15, 2023

RELEVANCE LOGICS

A relevance logic is motivated by the idea that the premises of a valid argument must be somehow “relevant” to its conclusion. The idea is motivated by the fact that…
Logic
November 15, 2023

PROPOSITIONAL CALCULUS (PROPOSITIONAL LOGIC)

The simplest formal (logical) language is the propositional calculus. This considers the logical relationships that hold between complete propositions.
FORMS OF PHILOSOPHICAL WRITINGWriting Philosophy
November 19, 2023

THE ARGUMENTATIVE PAPER

Essays of assertion, affirmation, and refutation are all examples of the argumentative paper. An effective argument relies on factually true premises or premises for which you have strong support.
Philosophy BranchesTraditional Branches of Philosophy
December 12, 2023

ETHICS

Ethics is the study of morality and can be divided into three main areas of inquiry. Descriptive ethics concerns the actual moral beliefs held by specific individuals or societies and…
Modern Branches of PhilosophyPhilosophy Branches
November 14, 2023

PHILOSOPHY OF LANGUAGE

The study of natural languages is conventionally divided among questions of syntax, semantics, and pragmatics, all of which raise significant issues for the philosophy of language. In terms of syntax…
PHILOSOPHICAL BOOKS AND TEXT
November 27, 2023

ESSENTIAL READING IN THE HISTORY OF PHILOSOPHY

A comprehensive list of essential readings in the history of philosophy.
Writing Philosophy
November 23, 2023

GOOD PHILOSOPHICAL WRITING

BASICS OF GOOD PHILOSOPHICAL WRITING: A DEEPER DIVE Having surveyed the elements of good writing from 30,000 feet, let’s swoop in on some of the most important specifics. This means…
Logic
November 15, 2023

INTUITIONISM

One of the most familiar non-classical logics is intuitionism, which, in simple terms, is based upon the rejection of the law of excluded middle: (P ∨ ¬P). There are both…
Writing Philosophy
November 24, 2023

WHAT PHILOSOPHY PROFESSORS WANT FROM STUDENT WRITERS

Some 2,300 years ago, Aristotle introduced the syllogism into the intellectual world. A threeelement formula, it is the elementary building block of syllogistic logic and deductive reasoning. The syllogism combines…
History Of Philosophy
November 15, 2023

THE SOPHISTS

The Sophists were not a single school but a professional grouping of largely itinerant teachers of rhetoric, philosophy, and legal argumentation. Their importance lies not in any specific doctrines but…
History Of PhilosophyPOST-KANTIAN PHILOSOPHY
November 15, 2023

UTILITARIANISM

The French Revolution sparked legal and political reforms across Europe, which brought with them their accompanying philosophical frameworks.
Logic
November 15, 2023

MANY-VALUE LOGICS

In the classical logics already discussed, the logical connectives are taken to be bivalent—that is, they allow of only two different truth values: true and false. One natural extension to…
WHAT IS PHILOSOPHY?
November 12, 2023

WHAT IS THE “SUBJECT MATTER” OF PHILOSOPHY

“There is a common misunderstanding that philosophy—like chemistry or history—has a content to offer, a content that a teacher is to teach and a student is to learn,” writes Professor…
Modern Branches of PhilosophyPhilosophy Branches
November 14, 2023

PHILOSOPHY OF MATHEMATICS

The philosophy of mathematics is traditionally concerned with the ontological and epistemological foundations of mathematics. The two questions, of ontology and epistemology, are intimately related, as a satisfactory account of…
FORMS OF PHILOSOPHICAL WRITING
November 20, 2023

THE ESSAY OF AFFIRMATION

The essay of affirmation takes the position I agree. If you want to write an essay agreeing with—affirming—the ideas of another, such as a philosopher, a simple statement of agreement…

Books

  • The Convoluted Universe: Book Five (The Convoluted Universe series)

    $16.66
  • The Twilight of the Idols and the Anti-Christ: or How to Philosophize with a Hammer (Penguin Classics)

    $9.99
  • How to Know a Person: The Art of Seeing Others Deeply and Being Deeply Seen (Random House Large Print)

    $32.00
  • 通透 (Chinese Edition)

    $49.99
  • How Not to Kill Yourself: A Portrait of the Suicidal Mind

    $16.99
  • Pensées (Dover Thrift Editions: Philosophy)

    $7.00
  • The Brothers Karamazov: A Novel in Four Parts and an Epilogue

    $10.39
  • Discourse on Method and Meditations (Philosophical Classics)

    $8.95
  • My Big TOE: Discovery: Book 2 of a Trilogy Unifying Philosophy, Physics, and Metaphysics: Discovery

    $26.50
  • Bhagavad Gita: A New Translation

    $12.39
  • Sade My Neighbor (Studies in Phenomenology and Existential Philosophy)

    $22.95
  • The Stoic Challenge: A Philosopher’s Guide to Becoming Tougher, Calmer, and More Resilient

    $12.99
  • Zen Flesh, Zen Bones: A Collection of Zen and Pre-Zen Writings

    $9.99
  • The Philosophy of Aristotle (Signet Classics)

    $5.99
  • The Prince | Niccolò Machiavelli

    $7.99
  • Leviathan: With selected variants from the Latin edition of 1668 (Hackett Classics)

    $17.00

Terms & Concepts

C

Change of Quantifier (Quantifier Exchange) Rule

In quantifier logic, one quantified statement can be substituted for another that is logically equivalent to the original. A universally quantified statement is equivalent to an existentially quantified statement (and…
P

Private language argument

An argument, identified by Ludwig Wittgenstein (1889-1951), that no fixed meaning can be given to a language in the absence of a wider social context because there are no constraints…
L

Law of nature

A conditional statement expressing a general regularity (for example, all Fs are Gs) that is considered necessarily true—although philosophers disagree as to whether this is because it captures a metaphysically…
N
Noncognitivism
P
Psychologism egoism
S
Semiotics
C
Counterfactual
A
Appeal to pity (ad misericordiam)
M
Major term
K
Krishna
C
Causation (or causality)
R
Reflexive property
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