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Work this out!
if my great gran is you great great gran and your brothers gran is my mum then your sisters gran must be your great gran?
Re: Work this out!
Yes! Welcome to the forum!
In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.