Question: True or false? In each case, provide a proof or terexample. ( a ) AcC,BgD - + AxBceyp. ( b ) AgB,BgC - - +

True or false? In each case, provide a proof or terexample. (a) AcC,BgD-+AxBceyp. (b) AgB,BgC--+Agc. (c) A x B c C x D -+ A c C andB c D.(d) a c C and B c DifandontyifA x B c (e) tBBl Au B c Af1 B --> A: B.

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