feat(builtin/num): prove basic theorems using simplifier
feat(builtin/num): prove basic theorems using simplifier

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

fpvandoorn/lean2,htzh/lean,soonhokong/lean-osx,javra/lean,sp3ctum/lean,digama0/lean,fgdorais/lean,johoelzl/lean,digama0/lean,fpvandoorn/lean2,avigad/lean,leanprover/lean,leanprover/lean,fgdorais/lean,soonhokong/lean,avigad/lean,UlrikBuchholtz/lean,sp3ctum/lean,leanprover/lean,digama0/lean,htzh/lean,c-cube/lean,fgdorais/lean,sp3ctum/lean,avigad/lean,leodemoura/lean,leodemoura/lean,UlrikBuchholtz/lean,digama0/lean,javra/lean,fpvandoorn/lean2,leodemoura/lean,soonhokong/travis_test,soonhokong/travis_test,codyroux/lean0.1,johoelzl/lean,UlrikBuchholtz/lean,johoelzl/lean,soonhokong/lean-windows,leanprover-community/lean,UlrikBuchholtz/lean,htzh/lean,soonhokong/lean-osx,soonhokong/lean-windows,dselsam/lean,rlewis1988/lean,levnach/lean,soonhokong/lean-windows,dselsam/lean,javra/lean,soonhokong/lean-windows,c-cube/lean,soonhokong/lean-osx,avigad/lean,fgdorais/lean,rlewis1988/lean,fpvandoorn/lean,codyroux/lean0.1,soonhokong/lean-osx,fgdorais/lean,fpvandoorn/lean,Kha/lean,fpvandoorn/lean,fpvandoorn/lean,htzh/lean,leodemoura/lean,digama0/lean,leanprover-community/lean,dselsam/lean,codyroux/lean0.1,leanprover-community/lean,leanprover-community/lean,leodemoura/lean,Kha/lean,rlewis1988/lean,fpvandoorn/lean,soonhokong/lean,UlrikBuchholtz/lean,leanprover/lean,levnach/lean,soonhokong/lean-windows,rlewis1988/lean,levnach/lean,rlewis1988/lean,rlewis1988/lean,eigengrau/lean,eigengrau/lean,c-cube/lean,sp3ctum/lean,sp3ctum/lean,levnach/lean,javra/lean,Kha/lean,fpvandoorn/lean2,c-cube/lean,htzh/lean,eigengrau/lean,dselsam/lean,leanprover-community/lean,soonhokong/travis_test,soonhokong/travis_test,johoelzl/lean,johoelzl/lean,fpvandoorn/lean2,fgdorais/lean,soonhokong/lean,dselsam/lean,leanprover/lean,Kha/lean,eigengrau/lean,c-cube/lean,soonhokong/lean-osx,javra/lean,Kha/lean,eigengrau/lean,codyroux/lean0.1,soonhokong/lean,levnach/lean,soonhokong/lean,digama0/lean,avigad/lean,avigad/lean,leodemoura/lean,johoelzl/lean,fpvandoorn/lean,dselsam/lean,Kha/lean,leanprover/lean,leanprover-community/lean