text: One formalism named for this man relies on a formula which states that the off-diagonal Hamiltonian matrix elements H- sub-i j are equal to 1.75 times S-sub-i
full_question: One formalism named for this man relies on a formula which states that the off-diagonal Hamiltonian matrix elements H- sub-i j are equal to 1.75 times S-sub-i j times the arithmetic mean of the diagonal elements H-sub-i i and H-sub-j jthat's the Wolfsberg-Helmholtz formula. The transition states of pericyclic reactions can either have a Möbius topology or a topology named for this chemist. All of the Coulomb integrals are set to one value and all of the resonance integrals are set to another value in a method named for this man used to calculate the pi molecular orbitals of conjugated hydrocarbons. This chemist is the second namesake of an equation which states that the logarithm of the activity coefficient equals a temperature-dependent constant times the square of the charge times the square root of the ionic strength. For 10 points, name this German chemist who names a "limiting law" describing dilute electrolytic solutions with Debye (duh-BYE) and a rule stating that aromatic compounds possess 4 n plus 2 pi electrons.
first_sentence: One formalism named for this man relies on a formula which states that the off-diagonal Hamiltonian matrix elements H- sub-i j are equal to 1.75 times S-sub-i
raw_answer: Erich Hückel