Type I string theory (source code)

= Type I string theory
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= Type I superstring theory
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An unoriented theory containing open and closed superstrings. Consistent gauge and gravitational anomaly cancellation yields the familiar $\mathfrak{so}(32)$ gauge algebra. Open-string <Chan-Paton factors> supply the gauge degrees of freedom, while closed strings contain gravity. It is related by strong/weak duality to the corresponding heterotic theory.