For example, "=" is an equal sign, "≈" is an approximate sign, "≦" is an unequal sign and ">" is a greater than sign. "

"≤" is a symbol less than or equal to (it can also be written as "∈", that is, not greater than), → "represents the changing trend of variables," ∈ "is a similar symbol," ∈ "is a complete equal sign," ∨ "is a parallel symbol," is a vertical symbol, and "∈" is included in. It contains symbols.

Extended data

The square root number was once represented by the combination of the first and last letters of the Latin "radical". /kloc-At the beginning of the 0/7th century, the French mathematician Descartes used "√" for the first time in his Geometry. "√" is a variant of Latin word line "R", and "~" is a line enclosed.

/kloc-in the 6th century, the French mathematician Viette used "=" to indicate the difference between two quantities. However, Calder, a professor of mathematics and rhetoric at Oxford University in England, thinks that it is most appropriate to use two parallel and equal straight lines to indicate that two numbers are equal, so the equal sign "=" has been used since 1540.

159 1 year, the French mathematician Veda used this symbol in a large number of diamonds, and it was gradually accepted by people. /kloc-In the 7th century, Leibniz in Germany widely used the symbol "=", and he also used "∽" to indicate similarity and ""to indicate congruence in geometry.

Greater than sign ">" and less than sign "

Any number (full name quantifier)? Derived from the English word Arbitrary, because lowercase and uppercase are easily confused, the first letter of the word is capitalized and then inverted. Similarly, existential number (existential quantifier)? Reverse writing of e from the word Exist.

References:

Baidu encyclopedia-mathematical symbols