# type I string theory

> theory of strings where left- and right-movers are identified via orientifolding, obtained as IIB string theory with 32 spacetime-filling D9-branes (producing a O(32) gauge group) and a spacetime-filling O9-plane

**Wikidata**: [Q2276860](https://www.wikidata.org/wiki/Q2276860)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Type_I_string_theory)  
**Source**: https://4ort.xyz/entity/type-i-string-theory


## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)