= {ua}. An orthonormal set {ua} in a Hilbert space ♬ is said to be an honormal basis for H if it is maximal in the sense that if {u} is tained in some orthonormal subset E of H, then, in fact, E Let H be a Hilbert space and H ‡ {0}. Then H does contain honormal sets. For example, if x is a nonzero element of H, then ||~||} is surely an orthonormal set in H. To see that H contains

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Request Explain underlined portion from "Functional Analysis" by BV Limaye

 

An orthonormal set {ua} in a Hilbert space H is said to be an
orthonormal basis for H if it is maximal in the sense that if {u} is
contained in some orthonormal subset E of H, then, in fact, E = {u}.
Let H be a Hilbert space and H ‡ {0}. Then H does contain
orthonormal sets. For example, if x is a nonzero element of H, then
{x/||||} is surely an orthonormal set in H. To see that H contains
an orthonormal basis, and in fact, every orthonormal set E in H can
Request Explain has
Transcribed Image Text:An orthonormal set {ua} in a Hilbert space H is said to be an orthonormal basis for H if it is maximal in the sense that if {u} is contained in some orthonormal subset E of H, then, in fact, E = {u}. Let H be a Hilbert space and H ‡ {0}. Then H does contain orthonormal sets. For example, if x is a nonzero element of H, then {x/||||} is surely an orthonormal set in H. To see that H contains an orthonormal basis, and in fact, every orthonormal set E in H can Request Explain has
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