∈ belonging to A∈B means that a belongs to b (? Do not belong to)

Contain? (or the following supplement ≠ really contains.

The meanings of individual symbols are as follows:

= equal to ≠ not equal to greater than ||| Parallel ≥ greater than or equal to

≤ less than or equal to ≡≡ Constant is equal to or completely equal to π π.

|x| Absolute value ∽ Similarity ≌ Congruence >> is far greater than this number.

& lt& lt is much smaller than the sign.

Union and intersection

Be included in a circle.

β bet magnetic flux coefficient; Angle; Coefficient (commonly used in mathematics to represent an unknown angle)

φ fai magnetic flux; Angle (commonly used in mathematics to represent an unknown angle)

∞ infinity

Ln(x) logarithm based on e

Lg(x) logarithm based on 10

Integer function on floor (x)

Integer function under ceil(x)

X mod y of remainder

X-floor(x) fractional part

∫f(x)dx indefinite integral

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

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