Is ln, not in, which means natural logarithm, that is, logarithm based on e, and the source of e is the power of (1+ 1/n), so find the limit of n.

It has many wonderful properties, such as the derivative of lnx itself.

Main applications: 1+lnx ≤ x, (x > 0), when x= 1, etc.

In fact, lz has known since I entered high school. It's a common thing, but I admire the landlord's spirit of exploration. I knew nothing about these things before I entered high school.

If it really exists, it is English. I'm in.