fix(algebra/simplifier): reference norm_num namespace
fix(algebra/simplifier): reference norm_num namespace

UlrikBuchholtz/lean,soonhokong/lean-windows,avigad/lean,rlewis1988/lean,fgdorais/lean,leanprover/lean,fpvandoorn/lean,soonhokong/lean-osx,soonhokong/lean-osx,Kha/lean,leanprover-community/lean,levnach/lean,soonhokong/lean-windows,digama0/lean,fgdorais/lean,digama0/lean,digama0/lean,leodemoura/lean,Kha/lean,dselsam/lean,avigad/lean,leodemoura/lean,Kha/lean,soonhokong/lean,avigad/lean,rlewis1988/lean,rlewis1988/lean,Kha/lean,javra/lean,rlewis1988/lean,soonhokong/lean-windows,leanprover/lean,soonhokong/lean-windows,digama0/lean,fpvandoorn/lean2,fpvandoorn/lean2,levnach/lean,fpvandoorn/lean2,UlrikBuchholtz/lean,soonhokong/lean-osx,rlewis1988/lean,soonhokong/lean-osx,leanprover/lean,leanprover-community/lean,Kha/lean,dselsam/lean,johoelzl/lean,javra/lean,dselsam/lean,UlrikBuchholtz/lean,johoelzl/lean,avigad/lean,levnach/lean,leodemoura/lean,fgdorais/lean,fpvandoorn/lean,UlrikBuchholtz/lean,leodemoura/lean,dselsam/lean,leanprover/lean,dselsam/lean,soonhokong/lean-osx,fgdorais/lean,javra/lean,avigad/lean,leanprover-community/lean,avigad/lean,leodemoura/lean,fpvandoorn/lean,UlrikBuchholtz/lean,leanprover/lean,leanprover-community/lean,levnach/lean,leanprover/lean,fpvandoorn/lean,digama0/lean,rlewis1988/lean,fgdorais/lean,johoelzl/lean,johoelzl/lean,dselsam/lean,leodemoura/lean,javra/lean,fgdorais/lean,fpvandoorn/lean2,digama0/lean,leanprover-community/lean,soonhokong/lean,johoelzl/lean,Kha/lean,leanprover-community/lean,soonhokong/lean,fpvandoorn/lean,soonhokong/lean-windows,soonhokong/lean,levnach/lean,soonhokong/lean,fpvandoorn/lean2,johoelzl/lean,javra/lean,fpvandoorn/lean