例句與造句

1. *PM : every finite dimensional subspace of a normed space is closed, id = 6686-- WP guess : every finite dimensional subspace of a normed space is closed-- Status:
2. *PM : every finite dimensional subspace of a normed space is closed, id = 6686-- WP guess : every finite dimensional subspace of a normed space is closed-- Status:
3. Proof : if such a space has countable dimension, it is union of countably many linear finite dimensional subspaces, which are in particular closed subsets with empty interior : but that's impossible by the Baire category argument . ( If you prefer to use Banach spaces or Hilbert spaces, just observe that \ mathbb { R } ^ { \ mathbb { N } } has \ ell ^ 2 as a subspace, already with uncountable dimension for the same reason )-- talk ) 16 : 49, 25 September 2009 ( UTC)
4. It's difficult to find finite dimensional subspace in a sentence. 用finite dimensional subspace造句挺難的