Chapter 4 Vector Norms and Matrix Norms
4.1. NORMED VECTOR SPACES 215 Let Sn−1 1 be the unit ball with respect to the norm, namely Sn−1 1 = {x ∈ E |x =1}. Now, Sn−1 1 is a closed and bounded subset of a finite-dimensionalvectorspace,sobyBolzano–Weiertrass,Sn−1 1 is compact. On the other hand, it is a well known result of analysis
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