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ABC conjectureabstractabstract lang completenessactionadditive combinatoricsadele ringadic valuationaffine groupaffine spacesahiv22ahiv22supportalgebraic geometryalgorithmallow denyallows termalmost orthogonalityalmost periodicityanalysisanalytic number theoryanalytic setangular momentumangular velocityantichain operatorantichain tile countappendapprox hom pfrapproximationarcaritharithmetic geometryarithmetic progressionsas tensorasymptoticsasync runtimeauthorizationauthorizeauthorizerautomata theoryautomorphismauxiliaryball extensionball scalingbase changebase permbasicbasicsbasisbasis linearbatched evaluatorbehavioural theoryberlekamp welchbig opbijectivitybilinear formbindingbirthdaybisimulationbivariateblock rel distancebmobn254borel caratheodorybounding mutualbraketbridgebrownian motionbrun titchmarshbuchi congrbuchi congruencebuchi interbundledbundled semanticscaching logging oraclecaching oraclecadlagcadlag modificationcalculationscampanatocan reach 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Theoremfgfibringfidelityfieldfield strengthfinitary carlesonfinitefinite adele ringfinite coverfinite dimensionalfinite fieldfinitenessfinset termsfirstfirst estimatefive quantaflattenflex approxfoldingfolding polynomialforest complementforest unionforestsforkformal languagesformal logicfoundationsfourierFourier analysisfree semigroupfree statefrey packagefrobeniusfrom mathlibfrom unaryfull beta confluencefull beta eta confluencefull etafunctiongadgetsgauge transformationgen heapgen setsgeneralgeneralizedgenerate seedgeneric liftghost mapgradgradinggrid structuregromovgroupgroup theory stuffguruswamiguruswami sudanhaltinghamiltonianhandler from unaryhandler specsharmonic analysisharmonic waveharnackhas tauhas var adjointhash commitmentheat kernelheat solutionheat solution propertyhelperherbrand quotienthilbert kernelhilbert strong typehilbert94histholder normholder van der corputhom pfrhomotopyhopshprinciplehundred percenthypothesis testingideal gasidentical until 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Exists of surjective

groupCohomology.exists_of_surjective

Plain-language statement

Given map f: M ⟶ N and q : ℕ, if H^{q+1}(M) ⟶ H^{q+1}(N) is surjective, then any z : Z^{q+1}(N) can be written as f(z') + d(y) for some z' : Z^{q+1}(M) and y : C^q(M). Note that d is spelled as toCocycles.

number theoryclass field theorylocal fields

Source project: Class Field Theory

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