 ## SAT数学常用符号有哪些？ 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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