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We present a necessary condition for brane solutions to have their origins instring field theory. For such solutions, T-duality operations between IIA andIIB solutions should be well-defined. Nevertheless, not all S-brane solutionshave T-duality. The solutions that have T-duality and may accordingly beregarded as low-energy solutions of string field theory satisfy a condition inwhich some S-brane distributions are forbidden.

A necessary condition for brane solutions to have their origins in string field theory