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Ný síða: right|thumb|An involution is a function <math>f:X\to X,</math> which, when applied twice, brings one back to the starting point. '''Sjálfhverfa'''<ref name=...
(Ný síða: right|thumb|An involution is a function <math>f:X\to X,</math> which, when applied twice, brings one back to the starting point. '''Sjálfhverfa'''<ref name=...) |
(Enginn munur)
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