9.2Eilenberg-SteenrodHomologyAxiomsHistorically:1.Simplicalhomologywas - PPT Presentation
A3isnaturalThatisgivenfXAYBthediagramHnXAfHnYBHn1AfjAHn1BcommutesA4ExactnessHnAHnXHnXAHn1AHn1XHn1XAisexactforeverypairXAinAwher ID: 102816
A3)@isnatural.Thatis
givenf:(X;A)!(Y;B)