Question: , you should assess whether the argument is valid. If it is, use Fitch to construct a formal proof. You may use Ana Con but

, you should assess whether the argument is valid. If it is, use Fitch to construct a formal proof. You may use Ana Con but only involving literals and . If it is not valid, use Tarski's World to construct a counterexample.

6.31

Dodec(b) Cube(b)

Small(b) Medium(b)

(Small(b) Cube(b))

conclusion

Medium(b) Dodec(b)

6.32

Dodec(b) Cube(b)

Small(b) Medium(b)

Small(b) Cube(b)

conclusion

Medium(b) Dodec(b)

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