d = D _L
Returns the p,q th map on a (lower index) spectral sequence page. The relationship $D_{p,q} = D^{-p,-q}$ holds.
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.
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We compute a map on the third page of the spectral sequence associated to $K$.
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