文摘
This is a sequel to the paper [4], in which we introduced Drinfeld modular polynomials of higher rank, using an analytic construction. These polynomials relate the isomorphism invariants of Drinfeld class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022314X16000640&_mathId=si1.gif&_user=111111111&_pii=S0022314X16000640&_rdoc=1&_issn=0022314X&md5=1adcc89f5f300f328454c1441993f838" title="Click to view the MathML source">Fq[T]class="mathContainer hidden">class="mathCode">-modules of rank class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022314X16000640&_mathId=si2.gif&_user=111111111&_pii=S0022314X16000640&_rdoc=1&_issn=0022314X&md5=e34a634461a77b67b28203f2f58d833d" title="Click to view the MathML source">r≥2class="mathContainer hidden">class="mathCode"> linked by isogenies of a specified type. In the current paper, we give an algebraic construction of greater generality, and prove a generalization of the Kronecker congruences relations, which describe what happens when modular polynomials associated to P-isogenies are reduced modulo a prime P. We also correct an error in [4].