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SpectralSequences :: pruningMaps(SpectralSequencePage)

pruningMaps(SpectralSequencePage) -- compute the pruning maps on a spectral sequence page

Synopsis

Description

Returns the pruning maps which are cached in the process of pruning the spectral sequence page.

As a specific example consider the filtered complex $K$ below, obtained by multiplying the minimal free resolution of the rational quartic space curve by successive powers of the irrelevant ideal.

i1 : B = QQ[a..d];
i2 : J = ideal vars B;

o2 : Ideal of B
i3 : C = complete res monomialCurveIdeal(B,{1,3,4});
i4 : K = filteredComplex(J,C,4);

We compute an example of a pruning map below.

i5 : E = prune spectralSequence K;
i6 : pruningMaps E^2

--error or time limit reached in conversion of output to net: type 'debugError()' to run it again; will try conversion to string

o6 = PageMap{...31...}

o6 : PageMap

See also

Ways to use this method: