Changes between Initial Version and Version 13 of Ticket #17252
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 10/30/14 06:09:50 (5 years ago)
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Ticket #17252

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toneeds_review
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public/combinat/zabrocki/fixstrongtableaux/17252

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Anne Schilling
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381acd835802d712e3a4a7ba547c7aeb2393b94a

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Ticket #17252 – Description
initial v13 8 8 This is exactly what happens in this case because if you apply the sequence of transpositions t_{2,4} on t_{3,4} t_{4,5} T then in fact t_{2,4} does reduce the length of shape of the tableau by 1, but there are no cells of content 2 and 3 in the tableau t_{3,4} t_{4,5} T. 9 9 10 It looks like there are a couple of ways of catching this condition. It might be sufficient to check that applying the transposition t_{2,4} is not valid (because it really should be applying t_{2,0} instead). That fix might or might not be sufficient (and a counterexample will be difficult to identify). To be more thorough, I will verify that if t_{ij} decreases the length of the core by 1, then the labels of the cells in range(i,j) that are removed include exactly one negative label.10 The fix was to implement the method `to_transposition_sequence` recursively by checking that the result of applying `t_{i,j}` can reduced to the empty core.