ATS1835 Chapter Notes - Chapter 5: Nature One

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If two sentences are contradictory then one but be true and one must be false, but if they are inconsistent, then both could be false. Self-contradiction is logical inconsistency within a single statement; one part of the statement is inconsistent with another part. Self-contradictory statements are false, but false statements need not self-contradictory. Inconsistency with presuppositions: the presuppositions of a statement are other, unsaid, relevant statements that would normally be taken for granted if you believed or asserted the statement. Claims, issues and arguments: every argument contains at least one intended conclusion plus one or more supporting reasons, called premises. What is a claim: claims are statements, claims have to be capable of being true or false. What is the issue: we argue in order to settle issues. Issues arise when there is uncertainty about whether to accept or reject a claim: when two people are in an argument they are divided on the issue.

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