1. Let X be an inner product space. Using the parallelogram identity to prove by few lines the 2 Appolonius' identity: 1
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1. Let X be an inner product space. Using the parallelogram identity to prove by few lines the 2 Appolonius' identity: 1
1. Let X be an inner product space. Using the parallelogram identity to prove by few lines the 2 Appolonius' identity: 1]z – xl|2+1z – yl2 = }}\x – yll2 +2 ||z-(x+y)
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