Summary
In order to determine the propagators from the functional differential equation, it is not sufficient to give a boundary condition for the identically vanishing external source.
Riassunto
Per determinare i propagatori dalle equazioni differenziali funzionali, non è sufficiente dare una condizione al limite per la sorgente esterna che si annulla identicamente.
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This work was begun when the author was staying at Department of Physics, Israel Institute of Technology, Haifa.
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Yoshimura, T. Some considerations on the boundary conditions for functional differential equations. Nuovo Cim 37, 1160–1164 (1965). https://doi.org/10.1007/BF02773200
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DOI: https://doi.org/10.1007/BF02773200