feat(library/standard): add more basic theorems
feat(library/standard): add more basic theorems

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

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