Such as: I, 2+i, A, X, natural logarithm base E, pi.

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) and ratio (:).

Relational character

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

Combination symbol

For example, the square brackets [] in brackets () and the horizontal lines in braces {}-for example, (2+ 1)+3=6, [2.5x(23+2)+ 1]=x, {3.5+[3].

Natural symbol

Such as a plus sign, a minus sign, a plus sign or a minus sign.

leave out

Such as triangle (△), right triangle (Rt△), sine (sin), cosine (cos), function of X (f(x)), limit (lim), angle (∞), ∵ Because, (one foot can't stand) ∴ So, (.

(Formula: two points can't stand it) Sum (), multiply (∏), and take out all the different combination numbers (C(r)(n)) and powers (a, Ac, Aq, x n) of r elements from n elements at one time.

Permutation and combination symbol

C- number of combinations A- number of permutations N- total number of elements R- number of elements participating in selection! -factorial, like 5! = 5×4×3×2× 1 = 120 c- combination-combination A- arrangement-arrangement

Discrete Mathematical Symbols (Incomplete)

Full name quantifier? Existential quantifier ├ decider (formula can be proved in L) ╞ satisfier (formula is effective in E, formula can be satisfied in E) ┐ non-operational proposition conjunctive operational proposition disjunction (or) proposition. A