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Abcd c. Параллелограмм aa1 bb1 cc1 dd1. A B C D. A(1-B)=B(1-C)=C(1-A). ¬A ⋅ ¬B ⋅ C ⋅ D = 1.
Параллелограмм aa1 bb1 cc1 dd1. A B C D. A(1-B)=B(1-C)=C(1-A). ¬A ⋅ ¬B ⋅ C ⋅ D = 1.

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