Definition
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[0Y4]We denote by \(β/2π\) the quotient space \(β/βΌ\) where \(xβΌ y\iff (x-y)/(2π)ββ€\) is an equivalence relation that makes points equivalent that are an integer multiple of \(2π\). This space \(β/2π\) is called the space of real numbers modulo \(2π\).