A bstract There are various no-go theorems that tightly constrain the existence of local higher-spin theories with non-trivial S -matrix in flat space. Due to Yang-Mills theory scattering amplitudes, it makes sense revisit Weinberg’s soft theorem — a direct consequence Lorentz invariance does not take advantage unitarity and parity invariance. By working chiral representation originated from tw...

Sufficient conditions for the invariance of evolution problems governed by perturbations (possibly nonlinear) m-accretive operators are provided. The with respect to sublevel sets a constraining functional expressed in terms Dini derivative that functional, outside considered set directions determined operator. An approach non-reflexive Banach spaces is developed and some result improving recen...