EntityQ4284949· pop 7· linked from 13 articlesmatrix elementSign in to savein physicsConnectionshydrogenEntityheliumEntityquantum mechanicsEntityInternational Standard Book NumberEntitynuclear physicsEntitymatrixEntityparticle physicsEntityatomic physicsEntitySchrödinger equationEntityOCLC, Inc.Entitylinear mapEntityquantum stateEntityHamiltonian operatorEntitybra–ket notationEntityperturbation theoryEntitydouble beta decayEntityFermi's golden ruleEntityorthonormalityEntityDavid GriffithsEntityJ. J. SakuraiEntityCategoriesPerturbation theoryQuantum mechanics