Constant equals sign is generally used when some parameter variables are constants or constant expressions, which always indicates that the relationship has nothing to do with the variables. For example, the function f(x)≡k means that no matter what the value of x is, the value of this function is always k.

2. All equal signs

If △ABC is all equal to △A'B'C, it can be expressed as △ABC≠△A' b' c' (it can also be expressed as "").

3, equivalent to a number

Let p and q be two propositions. If pq is always true, it is said that P and Q are logically equivalent and marked as P ≡ Q. ..

4. Congruence symbol

Let m be a positive integer greater than 1, and A and B are integers. If m|(a-b), A and B are said to be congruent with the module M, and the module M is expressed as a≡b(mod m) and is expressed as congruence with the module M of B. ..

Extended data:

Mathematical symbols:

1, operation symbol

Such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (∩ ~), logarithm (log, lg, ln,

2. Relationship symbols

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

"∫" is a complete equal sign, "∨" is a coordinate symbol, "⊥" is a vertical symbol, "∝" is a symbol of direct proportion (reciprocal relation can be used to express inverse proportion), "∈" is a symbol, "?" Contained in the symbol "?" It contains symbols 2.

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