User:Tomruen/Noncrystallographic root systems
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There are just a few irreducible noncrystallographic root systems: H4, H3, H2, and I2(p) for p=5,7,8....
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Noncrystallographic_root_systems_as_foldings.png/640px-Noncrystallographic_root_systems_as_foldings.png)
There are just a few irreducible noncrystallographic root systems: H4, H3, H2, and I2(p) for p=5,7,8....