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Proof Directions
Indirect Proof
Given some knowledge
K
and a goal
G
.
We try
K
union {~
G
}
F(alse)
. If we are successful, then
G
holds.
We try
K
union {
G
}
F(alse)
. If we are successful, then ~
G
holds.
We will see some examples for special situations.
Author:
Wolfgang Schreiner
Last Modification: November 30, 1999