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

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**JaneFairfax****Member**- Registered: 2007-02-23
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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,332

Howabout

Q-(Q-)

*Last edited by George,Y (2009-02-10 12:20:38)*

**X'(y-Xβ)=0**

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