Posted by haifeng on 2016-04-05 00:02:17 last update 2016-04-05 00:02:17 | Answers (0) | 收藏
并非所有内积空间都具有正交基.
Whether all inner product spaces have an orthonormal basis? The answer is negative.
References:
https://en.wikipedia.org/wiki/Inner_product_space#Orthonormal_sequences
