Define the basic concepts of the algebra of logic: logical value, logical operation, logical formula.

A boolean is a constant or variable that can be TRUE or FALSE. There are six logical operations in Boolean algebra. They are called like this:
1) negation (inversion),
2) logical multiplication (conjunction);
3) logical addition (disjunction);
4) dividing disjunction;
5) following (implication);
6) equivalence.
The first three are basic logical operations. A logical formula is an expression containing logical values and signs of logical operations.

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