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Contradictions
Direct Proof
Given some knowledge
K
and a goal
G
.
We try
K
G
. If we are successful, then
G
holds.
We try
K
~
G
. If we are successful, then ~
G
holds.
We do not know in advance whether
G
is true!
Author:
Wolfgang Schreiner
Last Modification: November 30, 1999