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·     Work #1-7, 9-11, and 22-23.

style="color:rgb(45,59,69);"> (You can copy and paste the ∃ symbol.)

Help with the ones I could not figure out.

1.   X isn't a cat.

2.   Something is a cat ~(∃x)Cx

3.   Something isn't a cat. 0186

4.   It's false that there is something that isn't a cat ~(∃x)~Cx

5.   Everything is a cat

6.   If x is a dog, then x is an animal (DxÉAx)

7.   All dogs are animals (x)(DxÉAx)

9.  Some logicians are evil (∃x)(Lx·Ex)

10. No logician is evil

11. All black cats are unlucky (x)(Bx ·Cx)ÉUx)

22. All who are either dogs or cats are animals (x)((Dx n Cx) ÉAx)

23.All who are both dogs and cats are animals. (x)((Dx·Cx)ÉAx)

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