The skein lasagna module Poincaré series conjecture for the complex projective plane

Let Pn(t,q)P_n(t,q) denote the colored Khovanov Poincaré polynomial used in the paper, let S02(CP2;h;Q)\mathcal{S}_0^2(\overline{\mathbb{CP}^2};h;\mathbb{Q}) denote the skein lasagna module of CP2\overline{\mathbb{CP}^2} in H2H_2 grading hh, and let (a;q)m(a;q)_m denote the finite qq-Pochhammer symbol. Skein lasagna module Poincaré-series conjecture. The Poincaré series in H2H_2 gradings 00 and 11 are given by

P(S02(CP2;0;Q))=limnq2nP2n(t,q1)\operatorname{\mathcal{P}}\left(\mathcal{S}_0^2(\overline{\mathbb{CP}^2}; 0; \mathbb{Q}) \right) = \lim_{n \to \infty} q^{-2n}P_{2n}(t,q^{-1}) =11+q4tk=0t2k2q2k(k+1)(q4t;q2t2)2k+1(q2t2;q2t2)2k+t2(k+1)2q2((k+1)2+k)(q4t;q2t2)2k+2(q2t2;q2t2)2k+1,= \frac{1}{1+q^{-4}t} \sum_{k = 0}^\infty t^{-2k^2} q^{2k(k+1)} \frac{(-q^{-4}t; q^{2}t^{-2})_{2k+1}}{(q^{2}t^{-2}; q^{2}t^{-2})_{2k}} + t^{-2(k+1)^2} q^{2((k+1)^2 + k)} \frac{(-q^{-4}t; q^{2}t^{-2})_{2k+2}}{(q^{2}t^{-2}; q^{2}t^{-2})_{2k+1}},

and

P(S02(CP2;1;Q))=limnq2n1P2n+1(t,q1)\operatorname{\mathcal{P}}\left(\mathcal{S}_0^2(\overline{\mathbb{CP}^2}; 1; \mathbb{Q}) \right) = \lim_{n \to \infty} q^{-2n-1}P_{2n+1}(t,q^{-1}) =11+q4tk=0t2k(k+1)q2(k2+2k1)(q4t;q2t2)2k+1(q2t2;q2t2)2k+t2k(k+1)q2k(k+2)(q4t;q2t2)2k+2(q2t2;q2t2)2k+1.= \frac{1}{1+q^{-4}t} \sum_{k = 0}^\infty t^{-2k(k+1)} q^{2(k^2+2k-1)} \frac{(-q^{-4}t; q^{2}t^{-2})_{2k+1}}{(q^{2}t^{-2}; q^{2}t^{-2})_{2k}} + t^{-2k(k+1)} q^{2k(k+2)} \frac{(-q^{-4}t; q^{2}t^{-2})_{2k+2}}{(q^{2}t^{-2}; q^{2}t^{-2})_{2k+1}}.

These formulas are conditional in the surrounding discussion on the recursion conjecture and relate the skein lasagna module to limits of colored Khovanov homology. The supplied text does not state that the formulas have been proved or otherwise resolved.

Sources & referencesView supporting material

Primary source

Karim Ritter von Merkl, “Computing colored Khovanov homology”, arXiv:2505.03916 (2026).

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