logn (x, n)Logarithm base n of x
ln (x)Natural logarithm of x (base-E logarithm of x where E is Euler's constant)
lg (x)Logarithm base 10 of x, equivalent to logn (x, 10)
lb (x)Logarithm base 2 of x
exp (x)Exponential Function E to the power of x, equivalent to E^x