51Fxx Metric geometry
- 51F05 Absolute planes
- 51F10 Absolute spaces
- 51F15 Reflection groups, reflection geometries, See also {20H10,
20H15; for Coxeter groups, See 20F55}
- 51F20 Congruence and orthogonality, See also {20H05}
- 51F25 Orthogonal and unitary groups, See also {20H05}
- 51F99 None of the above but in this section
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