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Questions of the kind "What's the name for a X that satisfies property Y?"

3 votes
1 answer
183 views

What is the term for two figures being congruent and of same orientation?

In the plane, two figures are called congruent exactly if one can be transformed into the other by translation, rotation, and reflection. What if reflection is excluded, that is, preservation of orien …
Wolfgang Jeltsch's user avatar
2 votes
Accepted

What is the term for two figures being congruent and of same orientation?

While perhaps not widespread, the term “direct congruence” is used for this equivalence relation.
Wolfgang Jeltsch's user avatar
2 votes
0 answers
148 views

Is there a name for relations that are compatible with composition and union?

I’m dealing with relations on relations $\mathcal{R} \subseteq \mathcal{P}(A \times A) \times \mathcal{P}(A \times A)$ that have the following properties: $(R_{1}, S_{1}) \in \mathcal{R} \mathrel\we …
Wolfgang Jeltsch's user avatar