A=T+V+Va→平→D←平=F=T+V+V 儿 E 国 Proof: 4'as a test function for H: E。< (平'平= =ΨΨ+（平-Ψ E。< E6+(Ψ'T+Ve+Vet-i-Ve-V|平 E。< E+p(F){Ves-Ves}dr Y as a testfunction for H': Eo<Eo-p(F)[Ves-Ves}dr Summing up the last two inequalities: E+E%<E+E。 Contradiction!Ψ’ as a test function for H: Ψ as a testfunction for H’: Summing up the last two inequalities: Proof: Contradiction!