Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,406

hi Graham

Given:

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**noelevans****Member**- Registered: 2012-07-20
- Posts: 236

Hi Bob,

Have you seen this one? x^lny = y^lnx. Easier to prove than the one above.

Take the ln of both sides ln(x^lny) = (lny)(lnx). Also ln(y^lnx) = (lnx)(lny). Thus the original equality is true since their ln's are equal.

Writing "pretty" math (two dimensional) is easier to read and grasp than LaTex (one dimensional).

LaTex is like painting on many strips of paper and then stacking them to see what picture they make.

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