reducible polynomialreducible transformationreducible varietyreducing charge methodreducing flamereducing invariant subspacereducting invariant subspacereductio ad absurdumreductionreduction ad absurdumreduction ad absurdum methodreduction formulareduction of a fraction to its lowest termreduction of datareduction of orderreduction theoremreduction to common denominatorreduction to lowest termsreductive groupreductive lie algebrareductive stabilizerredundancyredundantredundant algebraicallyredundant constraintredundant constraintsredundant equationredundant geometricallyredundant in parametrizationredundant numberredundant systemreduplicatereelreentrant anglerefer toreferablerefererefered to the axesreferencereference anglereference framereference pointreference polynomialreference setreference systemreferent powerreferentialreffered to asrefinerefinement