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  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

{7/3}
2013-07-05 22:09:28

I want a proof that b for every positive b and n there is a real number x such that b^x=n

bob bundy
2013-07-05 20:19:00

This time, I think it is down to the definition:

http://en.wikipedia.org/wiki/Logarithm

Bob

{7/3}
2013-07-05 18:43:54

sorry forgot to say positive

bob bundy
2013-07-05 17:09:32

{7/3} wrote:

prove that if r is real,then log r is real.

hhmmm.  That's going to be tough when r is a negative real number.

Bob

{7/3}
2013-07-05 14:05:57

prove that if r is real,then log r is real.

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