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Why are there 5 string theories?

Updated: 8/17/2019
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13y ago

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String theory has 5 different types within the one theory. They are:

1. Type I

2. Type IIA

3. Type IIB

4. Type HO

5. Type HE

Each have 10 space-time dimensions and a new theory called, "m" theory combines all of these theories together. Each different theory deals with different forms of supersymetry between the different branes of the various string theories

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Q: Why are there 5 string theories?
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