(See Solution) In each of the following, determine whether or not is an inner product in the given vector space: For u and v in R^2 put =2 u_1


Question: In each of the following, determine whether or not \(\langle-,-\rangle\) is an inner product in the given vector space:

  1. For \(\mathbf{u}\) and \(\mathbf{v}\) in \(\mathbb{R}^{2}\) put \(\langle\mathbf{u}, \mathbf{v}\rangle=2 u_{1} v_{1}-u_{2} v_{2}\);
  2. For \(\mathbf{u}\) and \(\mathbf{v}\) in \(\mathbb{R}^{2}\) put \(\langle\mathbf{u}, \mathbf{v}\rangle=u_{1} v_{1}+2 u_{1} v_{2}+u_{2} v_{2} ;\)
  3. For \(\mathbf{u}\) and \(\mathbf{v}\) in \(\mathbb{R}^{2}\) put \(\langle\mathbf{u}, \mathbf{v}\rangle=u_{1}^{2} v_{1}^{2}+u_{2}^{2} v_{2}^{2}\).

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