数学符号英语读法，急

apostrophe

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Pronunciation of mathematical expressions
The pronunciations of the most common mathematical expressions are given in the list
below. In general, the shortest versions are preferred (unless greater precision is necessary).
1. Logic
9 there exists
8 for all
p ) q p implies q / if p, then q
p , q p if and only if q /p is equivalent to q / p and q are equivalent
2. Sets
x 2 A x belongs to A / x is an element (or a member) of A
x =2 A x does not belong to A / x is not an element (or a member) of A
A ?B A is contained in B / A is a subset of B
A ?B A contains B / B is a subset of A
A \ B A cap B / A meet B / A intersection B
A [ B A cup B / A join B / A union B
A n B A minus B / the di?rence between A and B
A ?B A cross B / the cartesian product of A and B
3. Real numbers
x + 1 x plus one
x ?1 x minus one
x ?1 x plus or minus one
xy xy / x multiplied by y<