A subset  of a Hilbert space 
 is a linear manifold if it is closed
 under addition of vectors and scalar
 multiplication.
Linear Manifold
See also
Hilbert Space, Subspace, Vector Space, von Neumann AlgebraThis entry contributed by Christopher Stover
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References
Loss, M. "A Synopsis of Hilbert Space Theory." 2014. http://people.math.gatech.edu/~loss/14SPRINGTEA/h-space.pdf.Referenced on Wolfram|Alpha
Linear ManifoldCite this as:
Stover, Christopher. "Linear Manifold." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/LinearManifold.html
 
         
	    
	
    
