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SAT数学常用符号有哪些?

来源:网络 2020-07-29 13:30:51

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Logical Symbols 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).  Logical Symbols  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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