Metamath Proof Explorer


Theorem helsh

Description: Hilbert space is a subspace of Hilbert space. (Contributed by NM, 2-Jun-2004) (New usage is discouraged.)

Ref Expression
Assertion helsh ℋ ∈ S

Proof

Step Hyp Ref Expression
1 helch ℋ ∈ C
2 1 chshii ℋ ∈ S