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Oct 10, 2018 at 10:21 vote accept Arnold Neumaier
Oct 10, 2018 at 10:15 comment added Robert Furber @YCor Infinite-dimensional unitary representations on a Hilbert space.
Oct 10, 2018 at 9:53 history edited Arnold Neumaier CC BY-SA 4.0
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Oct 10, 2018 at 9:33 comment added Arnold Neumaier @YCor I means inhomogeneous, the semidirect product with the translation group. massless representations with helicity s are defined in Wigner's classification of irreducible unitary representations of the Poincare group.
Oct 10, 2018 at 9:12 answer added Zurab Silagadze timeline score: 4
Oct 10, 2018 at 8:10 comment added YCor What is "massless"? what is "helicity"? representation means irreducible complex finite-dimensional representation? does "$ISO_0(3,1)$" mean the same as "$SO_0(3,1)$"? (SO stands for standard orthogonal, no idea about ISO).
Oct 10, 2018 at 8:07 history edited YCor
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Oct 10, 2018 at 7:07 history asked Arnold Neumaier CC BY-SA 4.0