Math 符号的英语发音.pdf

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Pronunciation of mathematical expressions
The pronunciations of the mon mathematical expressions are given in the list
below. In general, the shortest versions are preferred (unless greater precision is necessary).
1. Logic
there exists
∃
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 A x belongs to A / x is an element (or a member) of A
∈
x / 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 B A minus B / the di
erence 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
(x y)(x + y) x minus y, x plus y

x
x over y
y
= the equals sign
x = 5 x equals 5 / x is equal to 5
x = 5 x (is) not equal to 5
6
1
x y x is equivalent to (or identical with) y

x y x is not equivalent to (or identical with) y
6
x > y x is greater than y
x y x is greater than or equal to y

x < y x is less than y
x y x is less than or equal to y

0 < x < 1 zero is less than x is less than 1
0 x 1 zero is