ZHANG, Ruda June 14, 2022:  Minor edits; more on SVD, normal matrix, unitary matrix. [31e71f8]
ZHANG, Ruda June 04, 2022:  Add left/right inverse, matrix exponential, condition number, Frechet derivative, inverse. [667167e]
ZHANG, Ruda April 09, 2022:  More on least squares (general, iterally reweighted) [1529f42]
ZHANG, Ruda June 11, 2020:  More on multilinear operator, multivariate Taylor's formula. [35b024a]
ZHANG, Ruda June 11, 2020:  Format math. [2849f41]
ZHANG, Ruda April 18, 2020:  Topological and strong equivalent of norms and metrics. [c6ba1e3]
ZHANG, Ruda January 23, 2020:  More on Hilbert space. [a81f4f5]
ZHANG, Ruda January 21, 2020:  More on Hilbert space. [67ff8bb]
ZHANG, Ruda December 05, 2019:  More on manifolds, from John Marshall Lee's textbooks. [6ba9029]
ZHANG, Ruda May 23, 2019:  Compare concepts in linear operator theory and matrix theory. [d2d1928]
ZHANG, Ruda May 22, 2019:  More on linear operators. [27de1ed]
ZHANG, Ruda May 16, 2019:  More on measure space, linear operators. [3390fb8]
ZHANG, Ruda April 28, 2019:  More on linear operators, algebra. [8629d3e]
ZHANG, Ruda April 26, 2019:  More on linear operators [c2b216d]
ZHANG, Ruda April 21, 2019:  More on analysis [ebac375]