+ plus

　　- minus

　　* multiplied by ;times

　　÷ divided by

　　= equals

　　≈ approximately equals

　　≠ not equal to

　　< less than

　　> greater than

　　≤ equal to or less than

　　≥ equal to or greater than

　　()

　　round brackets ;parentheses

　　[]

　　square brackets

　　{ }braces

　　∈ is a member of the set

　　is a subset of

　　∽ similar to

　　≌ congruent to

　　* denotes an operation

　　∴ therefore

　　∵ because

　　∶ ratio sign, divided by

编辑：张雨

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