- #1

syki

- 2

- 0

## Homework Statement

Prove:

ln(η) = Σ[xi*ln(ηi)]

**2. The attempt at a solution**

I tried using the relationship:

Σ(xi)=1

and the rules for adding logarithms, but I seem to be totally failing at this. I'm not asking to have it worked out, but any hints on which direction I should go?