The Big Bang Theory | Theory of a Deadman | music theory | probability theory | theory | Theory of relativity | theory of relativity | Social learning theory | Game Theory (band) | Game Theory | Conspiracy theory | Music theory | K-theory | AP Music Theory | The Institutes for the Achievement of Human Potential | Piaget's theory of cognitive development | conspiracy theory | Theory of Relativity | Theory | Terror management theory | Invariant theory | information theory | graph theory | Galois theory | Einstein–Cartan theory | Conspiracy Theory with Jesse Ventura | Chaos theory | Terror Management Theory | representation theory | Recapitulation theory |
He also substantially contributed to the development of the theory of capacities, nonlinear potential theory, the asymptotic and qualitative theory of arbitrary order elliptic equations, the theory of ill-posed problems, the theory of boundary value problems in domains with piecewise smooth boundary.