Let $V$ be a neighbourhood of zero. Is it true that there always exists neighbourhoods of zero A and B such that $V=A+B$?
If this is true, then could it be generalized to neighbourhood of any point, not only zero?
2026-03-26 09:41:53.1774518113
In TVS, is it true that every neighbourhood of zero is sum of some two other neighbourhoods of zero
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