We call the product \(\mathbb{T}^n:= \mathbb{S}^1\times \cdots \times \mathbb{S}^1\) of \(n\) copies of \(\mathbb{S}^1\) the \(n\)-torus.
Remarks
We call the product \(\mathbb{T}^n:= \mathbb{S}^1\times \cdots \times \mathbb{S}^1\) of \(n\) copies of \(\mathbb{S}^1\) the \(n\)-torus.