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Unit 1 · Discrete Structures and Optimisation Paper 2 CS · December 2022 Shift 2

Consider the following statements:
A. There exists a Boolean algebra with 5 elements.
B. Every element of a Boolean algebra has a unique complement.
C. If a lattice L is a Boolean algebra then L is not relatively complemented.
D. The direct product of two Boolean algebras is also a Boolean algebra.
Choose the correct answer about the four statements.

Pick an option to check yourself, or open the answer below.

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Correct answer: B. Only B and D are correct

Explanation

A finite Boolean algebra has 2n elements, so A is false. B is true (distributive and complemented). A Boolean algebra is relatively complemented, so C is false. D is true.

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