⊥ ∥ ∠ ⌒ ⊙ ≡ ≌ △

2 algebraic symbols

∝ ∧ ∨ ~ ∫ ≠ ≤ ≥ ≈ ∞ ∶

3 operation symbol

× ÷ √

4-symbol set

∪ ∩ ∈

Five special symbols

∑π(π)

6 reasoning symbol

| a |⊥∽△∞∩∩≦≦≤∈ⅲ

↑ → ↓ ↖ ↗ ↘ ↙ ∥ ∧ ∨

& amp；

① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩

Γ Δ Θ Λ Ξ Ο Π Σ Φ Χ Ψ Ω

α β γ δ ε ζ η θ ι κ λ μ ν

ξ ο π ρ σ τ υ φ χ ψ ω

Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ Ⅺ Ⅻ

ⅰ ⅱ ⅲ ⅳ ⅴ ⅵ ⅶ ⅷ ⅸ ⅹ

∈ ∏ ∑ ∕ √ ∝ ∞ ∟ ∠ ∣ ∥ ∧ ∨ ∩ ∪ ∫ ∮

∴ ∵ ∶ ∷ ∽ ≈ ≌ ≒ ≠ ≡ ≤ ≥ ≦ ≧ ≮ ≯ ⊕ ⊙ ⊥

⊿ ⌒ ℃

Index 0 123:? 0? 2? 0? 1? 0? 5? 0? six

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.

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] 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

∈ ∏ ∑ √ ∞ ∠ ∣ ∥ ∧ ∨ ∩ ∪ ∫ ∮ ∴ ∵ ∽

≈ ≌ ≠ ≡ ≤ ≥ ≦ ≧ ⊕ ⊙ ⊥