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References to 'congruence axioms'
1. angle by CWoo
2. axiomatic geometry by CWoo
3. circle has one center by Wkbj79
4. commutative language by CWoo
5. equivalent regular expressions by CWoo
6. Euclidean geometry of plane by matte
7. Fermat's little theorem by CWoo
8. midpoint by Mathprof
9. neutral geometry by CWoo
10. proof of uniqueness of center of a circle by CWoo
11. quotient category by CWoo