The conjecture on odd-degree torsion in the cohomology of M

About 7 years old · traced to

Let MM and XX be the spaces in the paper, let pp be the prime under consideration, and let kk be as above. Write tpi(M)t_p^i(M) for the exponent of the pp-primary torsion in Hi(M,Z⁡)H^i(M,\operatorname{\mathbb{Z}}), and let ℓ+i(X)\ell_+^i(X) and ℓ−i(X)\ell_-^i(X) denote the corresponding coefficients associated with XX. Odd-degree torsion conjecture.

tp2k+1(M)=∑j=0k−1ℓ+2j(X)+∑j=0k−1ℓ−2j+1(X).t_p^{2k+1}(M)=\sum_{j=0}^{k-1}\ell_+^{2j}(X)+\sum_{j=0}^{k-1}\ell_-^{2j+1}(X).

This conjecture proposes a precise way for the torsion to be distributed in H2k+1(M,Z⁡)H^{2k+1}(M,\operatorname{\mathbb{Z}}), complementing the preceding result for the sum of the torsion exponents in complementary odd degrees. Its status is not determined by the supplied source context.

References

Primary source

Grégoire Menet, “Integral cohomology of quotients via toric geometry”, arXiv:1908.05953 (2022).

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