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### Re^4: Constants you cannot help but remember

 on Jun 10, 2004 at 00:14 UTC ( #362945=note: print w/ replies, xml ) Need Help??

As I recall it, Phi was unique because it was the only solution to equation, (X^2)-1=X. Also, 1/Phi= Phi-1. It's kind of a fun number to play with, if you're into that sort of thing...

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Comment on Re^4: Constants you cannot help but remember
Re^5: Constants you cannot help but remember
by BrowserUk (Pope) on Jun 10, 2004 at 01:03 UTC

I kinda guessed that poqui had used the wrong formula:) This is 'Golden Mean' by another name isn't it?

Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail

Sure, it's the golden mean, (sqrt(5)+1)/2. Knuth calls it phi in the Concrete Mathematics. (Note the fine way Knuth abuses greek letters: the golden mean phi is \phi but the Euler-phi function is written as \varphi in the book.)

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