Maximal neutrino mixing and maximalCPviolation

We propose a phenomenological model of lepton mixing and $\mathrm{CP}$ violation based on the flavor democracy of charge leptons and the mass degeneracy of neutrinos. A nearly bimaximal flavor mixing pattern, which is favored by current data on atmospheric and solar neutrino oscillations, emerges naturally from this model after explicit symmetry breaking. The rephasing-invariant strength of $\mathrm{CP}$ or T violation can be as large as one percent, leading to significant probability asymmetries between ${\nu }_{\mu }\to {\nu }_e$ and ${\overline{\nu }}_{\mu }\to {\overline{\nu }}_e$ (or ${\nu }_e\to {\nu }_{\mu })$ transitions in the long-baseline neutrino experiments.