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解析SAT数学考试中常见的A-b意思
资讯 · 2018-04-16 10:34:33
和启德考培小编一起来看看SAT数学考试中常见的A-b这些逻辑符号到底是什么意思吧~

  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?和启德考培小编一起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.

  以上就是启德考培小编为大家整理的SAT备考资料,希望能够帮助到大家。如果想了解更多关相关信息,请关注启德考培宁波分校平台,免费获取备考提分解决方案,或欢迎 点击这里 进行网络咨询,我们会给您提供专业的服务。最后,预祝大家能在SAT考试中取得理想中的成绩。


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