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References to 'anti-isomorphism'
1. characteristic monoid by CWoo
2. composition algebra by Algeboy
3. hollow matrix rings by Algeboy
4. involutory ring by CWoo
5. Lie group by rmilson
6. module by yark
7. non-commutative rings of order four by Wkbj79
8. opposite group by Wkbj79