First order logic formula

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Published on 2010-04-08T00:48:06Z Indexed on 2010/04/08 0:53 UTC
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logic

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homework

R(x) is a red block
B(x) is a blue block
T(x,y) block x is on top of block y

Question:
Write a formula asserting that if no red block is on top of a red block then no red block is on top of itself.

My answer: (Ax)(Ay)(R(x) and R(y) -> ~T(x,y))->(Ax)(R(x)-> ~T(x,x)) A = For all

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