Mathematically, these symbols: α α, β β, γ γ, δ δ, ε ε ε, ζ η, θ θ, ι yota, κ κ κ, λ λ, μ mio, ν new, ξ kexi, ο omega clone, π pie, ρ soft.

For example, there used to be several kinds of plus signs, and the "+"sign is commonly used in modern mathematics. "+"comes from Lavin "et" (meaning "harmony"). /kloc-in the 6th century, Italian scientist Nicolo Tartaglia used the first letter of Italian word "plu" (meaning "add") to indicate addition, and the grass was "μ", which finally became "+". The number "-"is derived from the Latin word "minus" (meaning "minus"). It was abbreviated to M at first, but later it was simplified to "-"because it was written quickly.

Multiplication has been used for more than a dozen times, and there are two kinds of modern mathematics. One is "x", which was first proposed by British mathematician orcutt on 163 1; One is "",which was first created by British mathematician heriott. Leibniz, a German mathematician, thinks that "×", like the Latin letter "X", may cause confusion and opposes the use of "×" (in fact, point multiplication is also easily confused with decimal point in some cases). Later, he also proposed to use "∩" to represent multiplication. This symbol has been applied to set theory in modern times.