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

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 +i(X)\ell_+^i(X) and i(X)\ell_-^i(X) denote the corresponding coefficients associated with XX. Odd-degree torsion conjecture.

tp2k+1(M)=j=0k1+2j(X)+j=0k12j+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.

Sources & referencesView supporting material

Primary source

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

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