The fundamental logical concepts

Part 2 – The conjunction

Definition: A conjunction is a joint or simultaneous occurrence.

Two things are expressed in 2 statements that are combined with the operand ‘and’. Both these statements are complete sentences, with their own subject and predicate. Although being independent from each other, these 2 main clauses together form 1 joined statement.

Other words that can join (or coordinate) statements are: but, for, nor, or, so, yet

From the 4 logical parts that together make up the conjunction, 3 of them are excluded:
the 1st sentence with negated 2nd sentence;
the negated 1st sentence with 2nd sentence
the negated 1st sentence with negated 2nd sentence.
Included is: the 1st and 2nd sentence.

conjunction

 conjunction meaning

A

˄

B

 The sun shines and we have a picnic

T

T

T

The sun shines; we have a picnic

T

F

F

It is not the case that the sun shines and we don’t have a picnic

F

F

T

It is not the case that the sun doesn’t shine and we have a picnic

F

F

F

It is not the case that the sun doesn’t shine and we don’t have a picnic
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