∞ 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.

Natural logarithm of ln(x)

Logarithm with base 2

Log(x) ordinary logarithm

Integer function on floor (x)

Integer function under ceil(x)

X mod y of remainder

{x} fractional part x-floor(x)

∫f(x)δx indefinite integral

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

[P] P] If p is true, it is equal to 1, otherwise it is equal to 0.

∑[ 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.

# Multiple elements in set A

∑(n=p, q)f(n) represents the sum of f(n) caused by the gradual change of n from p to q,

If f(n) is structured, it should be enclosed in brackets;

∑(n=p，q； R=s, t)f(n, r) stands for ∑(r=s, t)[∑(n=p, q)f(n, r)],

If f(n, r) is structured, f(n, r) should be enclosed in brackets;

∏(n=p, q)f(n) represents a continuous product of f(n), where n gradually changes from p to q,

If f(n) is structured, it should be enclosed in brackets;

∏(n=p，q； R=s, t)f(n, r) means ∏(r=s, t)[∏(n=p, q)f(n, r)],

If f(n, r) is structured, f(n, r) should be enclosed in brackets;

Lim(x→u)f(x) represents the limit when x of f(x) tends to u,

If f(x) is structured, it should be enclosed in brackets;

lim(y→v； X→u)f(x, y) represents lim(y→v)[lim(x→u)f(x, y)],

If f(x, y) is structured, f(x, y) should be enclosed in brackets;

∫(a, b)f(x)dx represents the integral of f(x) from x=a to x=b,

If f(x) is structured, it should be enclosed in brackets;

∫(c，d； A, b)f(x, y)dxdy means ∫(c, d)[∫(a, b)f(x, y)dx]dy,

If f(x, y) is structured, f(x, y) should be enclosed in brackets;

∫(L)f(x, y)ds represents the integral of f(x, y) on the curve l,

If f(x, y) is structured, f(x, y) should be enclosed in brackets;

∫∫(D)f(x, y, z)dσ represents the integral of f(x, y, z) on surface d,

If f(x, y, z) is structured, f(x, y, z) should be enclosed in brackets;

∮(L)f(x,y)ds represents the integral of f(x, y) on the closed curve l,

If f(x, y) is structured, f(x, y) should be enclosed in brackets;

∮∮(D)f(x,y,z)dσ represents the integral of f(x, y, z) on the closed surface d,

If f(x, y) is structured, f(x, y) should be enclosed in brackets;

∨( n = p, q)A(n) represents the union of A(n) from p to q,

If A(n) is structured, A(n) should be enclosed in brackets;

∨( n = p，q； R=s, t)A(n, r) means ∨( r = s, t)[∨( n = p, q)A(n, r)],

If A(n, r) is structured, A(n, r) should be enclosed in brackets;

∩(n=p, q)A(n) represents the intersection of a (n) and the gradual change of n from p to q,

If A(n) is structured, A(n) should be enclosed in brackets;

∩(n=p，q； R=s, t)A(n, r) means ∩(r=s, t)[∩(n=p, q)A(n, r)],

If A(n, r) is structured, A(n, r) should be enclosed in brackets.