Talk:Logarithmic identities

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[edit] Nested logarithms?

Does anyone know of any identies pretaining to nested logarithms? (e.g. log_a(log_b(x))) -- He Who Is^{[ Talk ]} 18:27, 28 June 2006 (UTC)

I'm not aware of any identities. Nested logs quickly become undefined, when the next to last log becomes negative. Log (abs(x)) is very unstable when nested. --agr 18:52, 29 June 2006 (UTC)

Well, when the original logarithm is negative, its still defined. Its just defined as a complex number. (e.g. log₂ − 4 = 2 + iπ) -- He Who Is^{[ Talk ]} 22:54, 29 June 2006 (UTC)

I'm fairly certain agr meant undefined in the Reals. --Ķĩřβȳ♥ŤįɱéØ 10:13, 28 December 2006 (UTC)

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