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SAT数学考试中的常用逻辑符号：A ⇔ B 是啥意思呢?

小站整理2018-03-14 15:28:38

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摘要：SAT数学考试中会遇到一些逻辑符号(Logical Symbols)，乍一眼看上去奇奇怪怪的，这些逻辑符号到底表示的是什么意思呢?本文特地为大家整理了一些关于SAT数学中常见的逻辑符号，大家一定要混个眼熟哦~

在SAT数学考试中，或多或少的都会经常出现一些常用逻辑符号，感觉有点眼生，怎么办？那我们就来看看这些逻辑符号到底是什么意思吧~

A ⇒ B means if A is true then B is also true; if A is false then nothing is said about B.

→ may mean the same as ⇒ (the symbol may also indicate the domain and codomain of a function; see table of mathematical symbols).

⊃ may mean the same as ⇒ (the symbol may also mean superset).

A ⇔ B means A is true if B is true and A is false if B is false.

The statement ¬A is true if and only if A is false.

The statement A ∧ B is true if A and B are both true; else it is false.

The statement A ∨ B is true if A or B (or both) are true; if both are false, the statement is false.

∀ x: P(x) means P(x) is true for all x.

∃ x: P(x) means there is at least one x such that P(x) is true.

∃! x: P(x) means there is exactly one x such that P(x) is true.

x ⊢ y means y is derived from x.

以上就是小站为大家整理的SAT数学考试中常见的逻辑符号，希望对大家的数学考试有所帮助。宝宝们一定要细心哦，避免小错误。小站会一直陪在大家身边，祝宝宝们取得好成绩!

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