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I was going through the following paper: http://www.emis.de/journals/HOA/AAA/Volume2011/142128.pdf

In page 6, immediately after equation (3.15), its written that "functions of the form v(t) are dense in L^2". I have been looking for proofs online which verifies the above statement but unable to find one. I would appreciate if someone can direct me to a link or explain with proof of how the functions of the form v(t) are dense in L^2.

Thank you,

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# Why is a set of functions v(t) dense in L^2

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