Because strings have two motion modes, which can exchange, in each dimension, which can exchange, strings with small and large dimensions have same physical effects {T-duality}. Because strings have two motion modes, which can exchange, in each dimension, which can exchange, closed strings and open strings also have T-duality.
Physical Sciences>Physics>String Theory>Duality
5-Physics-String Theory-Duality
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Date Modified: 2022.0224