A complete set of meaningful mathematical symbols and operational symbols

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

A complete set of mathematical symbols and related meaning symbols

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

A complete set of mathematical symbols and symbols with combined meanings

Such as square brackets (), brackets [], braces {} and horizontal lines-=.

A complete set of meaningful mathematical symbols and natural symbols

Such as plus sign, minus sign, plus sign (and corresponding minus sign).

Encyclopedia of Mathematical Symbols and Meaningful Elliptic Symbols

Such as triangle (delta), right triangle (rt delta), sine (sin) (see trigonometric function),

Hyperbolic sine function (sinh), function of x (f(x)), limit (lim), angle (∞),

Because (one foot can't stand)

So (if you stand on two feet, you can stand) (formula: because you can't stand, you have two points; Because the top two points, the bottom two points)

Sum, add: ∑, quadrature, multiply: ∏, take out all different combinations of r elements from n elements (the total number of n elements; R the number of elements participating in the selection), idempotent.