Conditions: a≥0, n≥2, n ∈ n

Conditions: a≥0, n≥2, n ∈ n

Conditions for establishment: a≥0, b>0, n≥2 and n ∈ n

Conditions for establishment: a≥0, b>0, n≥2 and n ∈ n

Extended data:

Origin of root symbol:

In ancient times, Egyptians used the symbol ┌ to represent the square root. Indians write ka in front of the square root number. Used by Arabs. Around 1840, the Germans used the dot "."to represent the square root, two dots "..." to represent the square root of degree 4, and three dots "..." to represent the cube root.

At the same time, some people use the capital r of the first letter of the Latin root of the word "root" to indicate the square operation, and then use the first letter q of the Latin word "square" or the first letter c of the "cube" to indicate how many times the square has been opened. For example, in the middle ages, someone wrote R.q.4352

The symbol of mathematician Bunbury (1526 ~ 1572) can be written as R.C.? 7p。 "where, R.q. 14╜? ╜ "is equivalent to brackets, and p (plus sign) is equivalent to a plus sign (even the addition and subtraction signs"+"and"-"were not common at that time).

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