Berechne die Tangentialabbildung T φ {\displaystyle {}T\varphi } zu
T R 3 = R 3 × R 3 {\displaystyle {}T\mathbb {R} ^{3}=\mathbb {R} ^{3}\times \mathbb {R} ^{3}} und T R 2 = R 2 × R 2 {\displaystyle {}T\mathbb {R} ^{2}=\mathbb {R} ^{2}\times \mathbb {R} ^{2}} .