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THE DIMATU
- Spieker center : the Spieker center of a given triangle ABC is the center of the Spieker circle of the triangle ABC.
- Spieker circle : the Spieker circle of a given triangle ABC is the incircle of the medial
triangle of ABC.
- Stabilizer : the stabilizer S of x in a group G is the subgroup of those
elements g of G such that gx = x.
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