Description: A closed subspace of a Hilbert space is a subset of Hilbert space. (Contributed by NM, 6-Oct-1999) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | chssi.1 | |- H e. CH |
|
Assertion | chssii | |- H C_ ~H |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | chssi.1 | |- H e. CH |
|
2 | 1 | chshii | |- H e. SH |
3 | 2 | shssii | |- H C_ ~H |