Wigner's (motivated by quantum mechanics) classification of the irreducible unitary representations of the Poincaré group (the group of automorphisms of R⁴ with the Lorentz metric) was not accepted by the "American Journal of mathematics" on the ground of not being mathematically interesting. Later it was published by "Annals of mathematics" on von Neumann's suggestion. In this work Wigner introduced the method of induced representations and “normal subgroup analysis”. Both became very important building blocks in the representation theory of Lie groups.

Wigner's (motivated by quantum mechanics) classification of the irreducible unitary representations of the Poincaré group (the group of automorphisms of R⁴ with the Lorentz metric) was not accepted by the "American Journal of mathematics" on the ground of not being mathematically interesting. Later it was published by "Annals of mathematics" on von Neumann's suggestion. In this work Wigner introduced the method of induced representations and “normal subgroup analysis”. Both became very important building blocks in the representation theory of Lie groups.

Wigner's (motivated by quantum mechanics) classification of the positive mass unitary irreducible representationsof the Poincare group (The group of automorphisms of R4 with the Lorentz metric) was not accepted by the "American Journal of mathematics" on the ground of not being mathematically interesting. Later it was published by the "Annals of mathematics" upon von Neumann's suggestion. In this work Wigner introduced the method of induced representations from normal subgroups. Wigner's work became an very important building block of the the representation theory of real reductive groups.

Wigner's (motivated by quantum mechanics) classification of the irreducible unitary representations of the Poincaré group (the group of automorphisms of R⁴ with the Lorentz metric) was not accepted by the "American Journal of mathematics" on the ground of not being mathematically interesting. Later it was published by "Annals of mathematics" on von Neumann's suggestion. In this work Wigner introduced the method of induced representations and “normal subgroup analysis”. Both became very important building blocks in the representation theory of Lie groups.