I discovered discovering an answer of 2-sat downside algorithm beneath.
The purpose are beneath
(1) when developing the implication graph
(2) discovering there isn’t a incidence of a variable x and its negation x’ in any SCC within the graph.
(3) then there may be all the time the answer at this 2-SAT downside.
it implies that all false 2-SAT downside have a variable x and its negation x’ in SCC of its implication graph.
I can’t perceive this level (3).
How can I show it has an answer if provided that there isn’t a x and x’ in a SCC?
It seems wish to me, though there isn’t a x and x’ in SCC, it may be false.
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