(I know the title contains a typo, but I can't edit it!) I'm trying to understand and/or prove this identity: blogbx = x I've inserted numbers, and it does work, but I just don't seem to understand why. I mean, some identities are obvious, like: logb bx = x since bx = bx but I can't make any sense of the top one. Also, I'm sorry for posting a lot. This is my third thread today!