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Commit 2022-11-14 15:10 ed98c07f

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feat(algebraic_topology/dold_kan): a few basic lemmas and a property of P_infty (#17538) This PR introduces some very basic lemmas for the complement projection Q of P. We also obtain the lemma ι_summand_comp_P_infty_eq_zero which states that in a given degree, P_infty vanishes on all the summands of a split simplicial object except one.

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