With point is false point and outside one kind of formality. Non-zero integer number and true point addition (negative integer number and true point subtraction) to form a point (or true point and false point phase addition and subtraction after simplification number), Generally read as a few and a few points, false point inverted number must not be greater than one.

A point with a point is a point one kind of formality and is usually discussed in the range of positive numbers. Discussed in The real number section, The absolute value satisfies the narrow point definition, that is, the generalized point. The tape point contains two parts: the whole number part and the true point part. There is a one-to-one correspondence between tape point and false point.