Question

How to Write:
Log2 (Nt-N0 )

As a logarithm ln:

Answer 1

Or Log2 (A-B)
as log Ln

Answer 2

\[\frac{ Log _{e}(Nt-N0) }{ Log _{e}2 }\]
Something like this e = Neper number

Answer 3

\[\ln (Nt-No) / \ln 2\]

Answer 4

Good @duck123