Question:Let G be a finite group and X be a G-set. K be a subgroup of G. let i be a group homomorphism from K to G . I am looking for the map i* = res : H^{a}{G}(X,M) --> H^{i*a}{K}(iX,iM).How can I compute this map for a constant Mackey functor ? Where a belongs to RO(G) and iX = X with K action induced by G. Note: For constant G- Mackecy fuctor M, iM is M as constant Mackey functor of K. Can anyone give some hint atleast for X= point.