# Open F-branes

@inproceedings{Hatsuda2021OpenF, title={Open F-branes}, author={Machiko Hatsuda and Warren Siegel}, year={2021} }

We include in F-theory, through open Type I F-theory branes (F-branes), string theories with N = 1 supersymmetry, both Type I and heterotic. Type I branes are distinguished from Type II by worldvolume parity projection. The same open Type I branes describe both open Type I superstrings and closed heterotic upon different sectionings from F-branes to worldsheets, while closed Type I superstrings arise from closed Type I branes. (Type II superstrings come from closed Type II branes, as described…

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