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

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#102 Re: Puzzles and Games » Correspondence Chess » 2015-04-11 07:56:00

I'm assuming you mean d5x?

1.c4 d5
2.d5x Nf6

#104 Re: Help Me ! » My question is concerned with set theory. » 2015-04-11 07:43:45

What's more, the definition of natural numbers hinges on the fact that {} is different from {{}}.

#108 Re: Help Me ! » Sequence » 2015-03-25 12:45:21

bob bundy wrote:

hi Stefy,

Thanks.  But I'm getting strange results from the second solution to the quadratic.  And I've tried two more examples with the same happening again.  I'm just trying to make sense of all my paperwork; then I'll post what I've found.

Bob

I didn't have to solve any quadratics...

#110 Re: Help Me ! » Telescoping sum? » 2015-03-25 09:19:03

A lot of stuff cancels out.

#113 Re: Help Me ! » Sequence » 2015-03-24 12:06:34

Hi Bob

I'm getting just one solution but it has nothing to do with complex numbers.

#116 Re: Guestbook » Linear Interpolation of FP1 Formula - Parallel Thread » 2015-03-24 04:09:41

Ah, you mean from his point of view. Yes, many think like that and many do not agree. It's a choice.

#118 Re: Puzzles and Games » Mate in 15...or less? » 2015-03-24 03:36:40

Was "White up" referring to the direction White's pawn are moving or the part of the board White's pieces occupy at the beginning?

#121 Re: Puzzles and Games » Mate in 15...or less? » 2015-03-23 23:54:07

Are you sure it's not white down black up. Cause if it's what you said, Black is already mated.

#122 Re: Puzzles and Games » Mate in three? » 2015-03-23 23:45:50

None of those is an optimal move, so it would never happen.

#123 Re: Help Me ! » Having trouble with this equation. » 2015-03-23 13:05:17

The second line is incorrect, because

What you can do is write

as
and take out the common factor of
out of both terms.

#124 Re: Puzzles and Games » Mate in three? » 2015-03-23 12:58:53

Um, phro, I don't think the black king can go to d5.

#125 Re: Puzzles and Games » Mate in three? » 2015-03-23 04:38:52

So, all the variations end up with a mate?

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