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Math Help - Space of polynomials in C0

  1. #1
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    Space of polynomials in C0

    Can someone show me how the space of polynomials which take [a,b] to R are a "thin" subset of C0[a,b], i.e. the space of continuous functions from [a,b] to R.

    Note: A "thin" subset is sometimes also called a "meager" subset and basically means that P can be written as the countable union of closed and nowhere dense sets:

     P = \bigcup_{k=1}^{\infty}H_k where  H_k is closed and nowhere dense.
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  2. #2
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    Consider H_k the subspace of polynomials of degree smaller or equal than k. This is closed, because it's a finite dimensional subspace, and has empty interior, because a proper subspace always has empty interior. The last assertion can be proved by showing that assuming the contrary would imply the existence of a ball centered at zero included in the subspace, a contradiction.
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