Sketchy Notes on Edmonds’ Incredible Shrinking Blossom Algorithm for General Matching



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has one iff does. Thus we need consider only the case in which the base of the blossom is free.



Suppose has an augmenting path. Either this path is an augmenting path in or it ends at the blossom, and it can be extended to an augmenting path in by following the blossom in the direction that results in alternation until reaching the base.
Suppose has an augmenting path. Either it is an augmenting path in or it hits the blossom, in which case the part from one end until the blossom is first hit is an augmenting path in


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