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- congruence-free condition
- congruence-free semigroup
- congruence function
- congruence group
- congruence in many variables
- congruence kernel
- congruence kernel of a homomorphism
- congruence lattice
- congruence method
- congruence-modular algebra
- congruence modularity
- congruence modulo a double modulus
- congruence modulo a prime
- congruence of angles
- congruence of conics
- congruence of curves
- congruence of figures
- congruence of forms
- congruence of higher degree
- congruence of lines
- congruence of matrices
- congruence of segments
- congruence of tangents
- congruence of triangles
- congruence on universal algebra