# What does disjunction mean in logic?

## What does disjunction mean in logic?

Disjunction, in logic, relation or connection of terms in a proposition to express the concept “or”; it is a statement of alternatives (sometimes called “alternation”).

## What is disjunction linguistics?

In linguistics, a disjunct is a type of adverbial adjunct that expresses information that is not considered essential to the sentence it appears in, but which is considered to be the speaker’s or writer’s attitude towards, or descriptive statement of, the propositional content of the sentence, “expressing, for example.

What is the rule for disjunction?

RULE OF INFERENCE: Disjunction. According to classical bi-valued logic, the disjunct of any sentence and its negation is always true, given that any given sentence must be either true or false. If p is true, the first disjunct is true and the whole sentence is true.

What does disjunction mean?

1 : a sharp cleavage : disunion, separation the disjunction between theory and practice. 2 : a compound sentence in logic formed by joining two simple statements by or: a : inclusive disjunction. b : exclusive disjunction.

### What is the symbol for disjunction?

Basic logic symbols

∨ + ∥ logical (inclusive) disjunction or
⊕ ⊻ ≢ exclusive disjunction xor; either or
⊤ T 1 Tautology top, truth
⊥ F 0 Contradiction bottom, falsum, falsity

### What is the truth value of disjunction?

Definition: A disjunction is a compound statement formed by joining two statements with the connector OR. The disjunction “p or q” is symbolized by p q. A disjunction is false if and only if both statements are false; otherwise it is true. The truth values of p q are listed in the truth table below.

Which is the logical fallacy of affirming a disjunct?

Logical Fallacy: Affirming a Disjunct Describes and gives examples of the formal logical fallacy of affirming a disjunct. (Sorry, your browser does not support inline frames.)

Which is the correct definition of disjunction in logic?

In logic, disjunction is a binary connective (\\(\\vee\\)) classically interpreted as a truth function the output of which is true if at least one of the input sentences (disjuncts) is true, and false otherwise.

## Which is the correct definition of affirming a disjunct?

Inclusive (or “weak”) disjunction: One or both of the disjuncts is true, which is what is meant by the “and/or” of legalese. Affirming a Disjunct is a non-validating form of argument when “or” is inclusive, as it is usually interpreted in propositional logic. Exclusive (or “strong”) disjunction: Exactly one of the disjuncts is true.

## Can a disjunction be true if it is undefined?

While on a strong Kleene interpretation, a disjunction can be true even if one of the disjuncts is undefined, on a weak Kleene interpretation, if one of the disjuncts is meaningless, the whole disjunction is meaningless as well. 27/08/2019