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 Post subject: Math riddles
PostPosted: Thu Aug 30, 2012 9:48 am 
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1. What's purple and commutative?

2. What's green and very far away?

3. What's yellow and equivalent to the Axiom of Choice?

Bill Smythe


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 Post subject: Re: Math riddles
PostPosted: Thu Aug 30, 2012 5:43 pm 
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I know the first one:
Hidden Text:
an abelian grape

It was the one and only joke attributed to our Professor Rankin in Glasgow

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 Post subject: Re: Math riddles
PostPosted: Fri Aug 31, 2012 9:54 am 
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Smythe Dakota wrote:
2. What's green and very far away?
The hedge at the bottom of my garden?


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 Post subject: Re: Math riddles
PostPosted: Wed Sep 05, 2012 9:26 am 
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rcbroughton wrote:
.... The hedge at the bottom of my garden?
How is this a math riddle? Hint: Think along the lines of the answer to the first one.

Bill Smythe


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 Post subject: Re: Math riddles
PostPosted: Wed Sep 05, 2012 4:40 pm 
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Smythe Dakota wrote:
rcbroughton wrote:
.... The hedge at the bottom of my garden?
How is this a math riddle? Hint: Think along the lines of the answer to the first one.

Bill Smythe
OK - how about a unified quantum field theory
fields (like hedges) are generally green, and an accepted unified theory is still a long way off . . .


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 Post subject: Re: Math riddles
PostPosted: Thu Sep 06, 2012 6:45 am 
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That's a lot better, but think fruit. Purple grapes, green _____ , yellow _____ .

Bill Smythe


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 Post subject: Re: Math riddles
PostPosted: Thu Sep 06, 2012 9:10 am 
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Smythe Dakota wrote:
That's a lot better, but think fruit. Purple grapes, green _____ , yellow _____ .
green grapes, greengages, green apples - I also had some green furry raspberries in the fridge but I had to throw them out


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 Post subject: Re: Math riddles
PostPosted: Mon Oct 22, 2012 7:43 pm 
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for the second one:
Hidden Text:
an infinite lettuce?


No ideas for the third one though: Axiom of Choice wasn't on my syllabus, so I'm very vague about it.

regards

PS scrub that: with a bit of a dabble in Google and Wikipedia, I have candidates after all:
Hidden Text:
Zorn's lemon
or
Hidden Text:
Tukey's lemon


That'll be it then

cheers

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