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The Question & Answer (Q&A) Knowledge Managenet

The Internet has many places to ask questions about anything imaginable and find past answers on almost everything.

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In the branch of linguistics known as pragmatics, a presupposition (or PSP) is an implicit assumption about the world or background belief relating to an utterance whose truth is taken for granted in discourse. Examples of presuppositions include: Jane no longer writes fiction. Presupposition: Jane once wrote fiction.

A pragmatic presupposition associated with a sentence is a condition that a speaker would normally expect to hold in the common ground between discourse participants when that sentence is uttered. Therefore the hearer can reason that the speaker is not presupposing the complement of “know” to be true.

Contradiction is a kind of semantic relation between sentences. Contradiction occurs when sentences are unlikely to be correct at the same time [1]. For example, the contradiction happens between the sentence pair “Some people and vehicles are on a crowded street” and “Some people and vehicles are on an empty street”.

A contradiction is a situation or ideas in opposition to one another. Examples of a contradiction in terms include, “the gentle torturer,” “the towering midget,” or “a snowy summer’s day.” A person can also express a contradiction, like the person who professes atheism, yet goes to church every Sunday.

If you are given any statement or argument, you can determine if it is a tautology by constructing a truth table for the statement and looking at the final column in the truth table. If all of the truth values in the final column are true, then the statement is a tautology.

If the statement is true, then the contrapositive is also logically true. If the converse is true, then the inverse is also logically true….Example 1:

Statement | If two angles are congruent, then they have the same measure. |
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Converse | If two angles have the same measure, then they are congruent. |