  Unitarily representable by transformations of Milne quantum-universe (MQU)
Hilbert-space vectors is a 9-parameter 'extended-Lorentz' Lie group whose
algebra comprises 9 conserved MQU-constituent ('quc') attributes: electric
charge, energy, spirality, 3-vector momentum and 3-vector angular momentum.
Commutation with the full symmetry algebra by the 3-element Lorentz-extending
sub-algebra identifies any quc by its (permanent) trio of charge, spirality and
energy integers. Milne's redshift-specifying 'universe age' is invariant under
the MQU symmetry group. Also invariant is the (elsewhere specified) universe
hamiltonian--a self-adjoint age-dependent Hilbert-space operator (not a
symmetry-algebra member) that generates universe evolution with increasing age
through a 'Schrodinger' (first-order) differential equation.
