A rectangle QQQ in Rn\mathbb R^nRn is a product of intervals in R\mathbb RR: Q=[a1,b1]×⋯×[an,bn].Q = [a_1,b_1]\times \cdots\times [a_n,b_n].Q=[a1,b1]×⋯×[an,bn].
Wikidata ID: Q209