Abstract
We revive Heisenberg's approach to multiparticle production in the context of soft-pion emission in heavy-ion collisions. Adopting appropriate boundary conditions, we find a general analytic solution of the classical equations of motion for the nonlinear $\ensuremath{\sigma}$ model (for soft pions this model is an approximation to QCD). The solution is used to discuss various features of soft pion production in nuclear collisions.
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