Some mathematical concepts are ended with "-oid", such as Matroid, greedoid, groupoid. What does that mean? Do these concepts share something in common? Thanks!
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Means "bed", "incomplet","deficient" or "weak". For exemple: Grupoid is a algebric struture "deficient" that is quase a Group.
If you have a "center" of an object, it means "equidistant" from the edges (spacially).
If you have a centroid, it means the weighted "center" of an object, where the weightS are something like the density of the material.
Here the "oid" is a reference to the "weighted" (e.g. center) property, not the literal one.