25-Approximations by orthogonal projection and function spaces

We formalize the concept of an orthogonal projection using the inner product and detail how the projection can be used to approximate functions in a vector space equipped with an inner product

[domechris]

Thank you for your detailed and thorough explanation.

[xinhao]

It's helpful to me. Thank you very much! By the way, at 30:42 of the video, I think there's a mistake <1, 1>=2 not 1