venture into :进入(探险)
orthogonal polynomials:正交多项式
extract concepts: that's the concept of vector space
Vector Space: consists of a set of vectors,
could be an infinite set and is likely to be an infinite set and a set of scalars, such as the real numbers,
that has a certain property which is that it's closed under vector addition, and scalar multiplication.
linearly independent : 线性独立
一组向量线性独立:
if
then
no vector in the set can be written as a linear combination of other vectors.
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