The inverted "a" in mathematics is an arbitrary number (full name quantifier) in mathematics. Derived from the English word Arbitrary, because lowercase and uppercase are easily confused, the first letter of the word is capitalized and then inverted; Existential number (existential quantifier) in inverted "E" symbolic mathematics. Reverse writing of e from the word Exist.

The symbols of mathematical operations include: plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (√) and logarithm (log).

Extended data:

Relation symbols commonly used in mathematics:

1, "=" is an equal sign, "material" is an approximate symbol (that is, approximately equal to), "≦" is an unequal sign, and ">" is a greater than sign. "

2. ""is a similar symbol, "≒" is a complete equal sign, "∨" is a coordinate symbol, "⊥" is a vertical symbol, "∝" is a proportional symbol (which can be expressed by reciprocal relation) and "∈" is a subordinate symbol. "contained in the symbol"? "is a containing symbol," | "means" separable "(for example, a|b? It means "A is divisible by B".

Baidu encyclopedia-mathematical symbols