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SAT数学考试中的常用逻辑符号:A ⇔ B 是啥意思呢?

2019-03-08 17:19 三立在线 admin

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摘要: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 superse

   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.

 

 

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