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What is the meaning of the semi-bracket symbol before K, and what is its meaning? Thank you for your answers! ~
This bracket is an integer function, which is the lower integer function and the upper integer function respectively!

The integer function b is rounded down, which means that it does not exceed the largest integer in parentheses.

The integer function a above represents the smallest integer in parentheses.

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Attached below is a picture with a detailed definition!