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Dear forum,

On Wed, 1 Dec 1999, Kurt Ewald wrote:

I read the sentence

" H is a subgroup fixing two letters and H is inverted by an Element of

order 2 in PSL(2,q)"

What does mean "H is inverted by an Element"

perhaps the explanation is possible in German.

H is cyclic group of order (q-1)/2 (q odd) or q-1 (q even).

Thus, "inverting H" most probably means inverting a generator of H.

This "Element" then sends each element of H to its inverse.

---

Dmitrii

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