# Logic Chapter 1

- StudyBlue
- Washington
- Western Washington University
- Philosophy
- Philosophy 102
- Daniel/howard-snyder
- Logic Chapter 1

**Created:**2012-01-02

**Last Modified:**2012-01-05

If A, then B.

A.

So B.

- contains an antecedent and a consequent (an if-then statement)

alternate ways of saying the same thing

- i.e. "given that, assuming that, if, etc."

If A, then B.

Not B.

So, Not A

the denial of a statement

- i.e. "Not A, it is not the case that, it's false that, it is not true that, etc"

If A, then B.

If B, then C.

So, If A, then C

statements of the form "Either A or B"

- each part is called a "disjunct"

EIther A or B

Not A

So, B

(A and B can be interchanged in the second and third premise, as long as it remains constant)

- ASSUME THAT statements of the form 'Either A or B' mean 'Either A or B (or Both)'

Either A or B.

If A, then C.

If B, then D.

So, either C or D.

- this form combines both conditional and disjunctive statements

checking to see whether the argument made is a form on the famous list; if it is, it is valid

- some valid forms are not famous
- does not show invalidity

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