  Within the Bethe-Salpeter formalism for instantaneous interactions, we
describe, along a totally analytic route, the lightest pseudoscalar mesons by
quark-antiquark bound states which show at least three indispensable general
features, namely, the (almost) masslessness required for pions and kaons to be
interpretable as (pseudo) Goldstone bosons, the suitable asymptotic behaviour
in the limit of large spacelike relative momenta as determined by the
relationship between quark mass function and Bethe-Salpeter amplitudes, and a
pointwise behaviour for finite spacelike relative momenta suited for
guaranteeing colour confinement.
