Problem

Example.The following argument form is valid:p →qq →r∴ p →rMany arguments in mathematics c...

Example.

The following argument form is valid:

pq

qr

pr

Many arguments in mathematics contain chains of if-then statements. From the fact that one statement implies a second and the second implies a third, you can conclude that the first statement implies the third. Here is an example:

If 18,486 is divisible by 18, then 18,486 is divisible by 9.

If 18,486 is divisible by 9, then the sum of the digits of 18,486 is divisible by 9.

∴ If 18,486 is divisible by 18, then the sum of the digits of 18,486 is divisible by 9.

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Solutions For Problems in Chapter 2.3