Exponential formula for one-time integrated semigroups.
Distribution semigroups on function spaces with singularities at zero.
On the functional equation T1 (t+s) T2 (t-s) = T3(t) T4(s).
On The Functional Equation: T1(t+s) T2(t-s) = T3(t) T4(s)
A spectrality condition for infinitesimal generators of cosine operator functions
The Method of Stationary Phase for Once Integrated Group
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