what does the word [n] mean in math
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Borys Shumyatskiy
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Hello!
For real number `x,` the symbol `[x]` means the integer part of `x,` i.e. the largest integer number not greater than `x.`
In decimal notation for positive `x=n.mkl...,`
`[x]=n.`
For example, `[2.1]=2.`
For negative `x=-n.mkl...`
`[x]=-n-1` if some numbers `m, k, l, ...` aren't zero.
For example, `[-2.1]=-3.`
For any integer `x` `[x]=x.`
Sometimes this function is called floor function and is denoted `|__x__|.`
The ceiling function is defined as the smallest integer not less than `x` and is denoted `|~x~|.`
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