Abstract
By using an explicit finite-difference scheme we get approximate expressions of the unequal-time commutators for short time intervals and some spectrum estimations for the two-dimensional quantum field theory \ensuremath{\square}\ensuremath{\varphi}+\ensuremath{\sigma}\ensuremath{\varphi}+\ensuremath{\lambda}${\ensuremath{\varphi}}^{3}$=0.
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