Elimination
The following argument forms are valid:
a.
b
These argument forms say that when you have only two possibilities and you can rule one out, the other must be the case. For instance, suppose you know that for a particular number x, x– 3 =0 or x + 2 = 0.
If you also know that x is not negative, then x = –2, so
x + 2 = 0.
By elimination, you can then conclude that
∴ x – 3 = 0.
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