In logic and related fields such as mathematics and philosophy, "if and only if" (often shortened as "iff") is paraphrased by the biconditional.

28 сент. 2011 г. · AiffB means A is true 'if' B is true & A is true 'only if' B is true.The 'only if' means that A is true in no other cases. solving iff logical statements - Mathematics Stack Exchange Symbol for "if and only if": $\implies$ or $\iff$? - Mathematics ... logic - is \iff the same as \equiv? When to use which? How to express an if and only if statement using ∧, ∨, and Другие результаты с сайта math.stackexchange.com

It says that P and Q have the same truth values; when "P if and only if Q" is true, it is often said that P and Q are logically equivalent.

27 февр. 2020 г. · “A iff B” is the same as “A if and only if B”. This means that when B is true, then A is true; when B is false, then A is also false.

28 мар. 2019 г. · The sample standard deviation of a data set is equal to zero if and only if all of the data values are identical. We break this biconditional ...

7 июл. 2021 г. · The biconditional statement “p if and only if q,” denoted p⇔q, is true when both p and q carry the same truth value, and is false otherwise.

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Опубликовано: 10 окт. 2014 г.

Just about every theorem in mathematics takes on the form “if, then” (the conditional) or “iff” (short for if and only if – the biconditional).

27 апр. 2024 г. · The symbol ≡ means logically equivalent and in a discrete class is typically defined A ≡ B provided A and B have the same truth table. It can be ... [Discrete Mathematics] Only-If statement. : r/askmath - Reddit [College]Discrete Math. Why is a conditional statement true if ... [Discrete Mathematics] Can someone explain logical ... - Reddit Другие результаты с сайта www.reddit.com

If and only if (ie, necessary and sufficient). The terms "just if" or "exactly when" are sometimes used instead.