symbolic meaning

∞ infinity

Pippi

The absolute value of the |x| function

Set up and merge

Set intersection

≥ greater than or equal to

≤ less than or equal to

≡ Constant is equal to or congruent with.

Ln(x) logarithm based on e

Lg(x) logarithm based on 10

X mod y of remainder

{x} fractional part

∫f(x)δx indefinite integral

∫ [a: b] The definite integral of f (x) Δ x a to b

∑[ 1≤k≤n]f(k) and n can be extended to many situations.

For example, ∑ [n is a prime number] [n

∑∑[ 1≤i≤j≤n]n^2

lim f(x)(x-& gt； ? ) seek the limit

M-order derivative function of f(z) f about z

C(n:m) combination number, where m is taken from n.

P(n:m) permutation number

Divisible by n

M⊥n coprime

A ∈ A a belongs to set A.

Physical symbols, Greek letters:

/view/244936.htm？ fr=ala0_ 1_ 1

Others still advise you to read books, those symbols are difficult to type ~

I wish you a happy college life!