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

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**mrpace****Member**- Registered: 2012-08-16
- Posts: 74

(a) Vx(Px U Ey(Qy ^ Py)) = Px

(b) Ey(Ex((Px v Qx) ^ Px)) U Py)

note: let V= for all, U= that symbol that looks like a U rotated anti clockwise quarter of a turn, E=there exists, ^=and, v=or

and the equals sign in the first line is meant to be 'logically equivalent to.

to me, all the variables look bound, but something tells me that's not right.

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