= Intersection homology cone formula
For a compact $(N-1)$-dimensional link $L$ and traditional perversity $\bar p$, finite-chain <intersection homology> of its open cone is $IH_i^{\bar p}(cL)=IH_i^{\bar p}(L)$ for $i<N-1-\bar p(N)$ and zero for $i\ge N-1-\bar p(N)$. Below the cutoff both chains and possible filling chains avoid the vertex. At and above the cutoff the cone on any allowable cycle is an allowable filling: its new vertex is allowed precisely when $0\le i+1-N+\bar p(N)$.
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