dd

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- February 12th 2007, 02:39 PMchillerbros17Discrete Math problem
dd

- February 12th 2007, 04:50 PMtopsquark
- February 12th 2007, 09:32 PMCaptainBlack
- February 12th 2007, 09:34 PMCaptainBlack
- February 13th 2007, 06:26 AMtopsquark
- February 13th 2007, 06:28 AMtopsquark
- February 13th 2007, 10:22 AMPlato
Proposition (a) is false. It says that there is a number in the domain that has the property that it times any other number in the domain equals 1: clearly false.

Its negation is (For all x)(there exists a y)[xy<>1].

Proposition (b) is of course true for the nonzero reals are an Abelian group. - February 15th 2007, 02:24 PMchillerbros17
What is the negation of (There exists x) (There exists y) [ 2x+y = 5 ^ x-3y = -8 ]

- February 15th 2007, 02:57 PMPlato