|  | ZHANG, Ruda | June 04, 2022: 
          Add left/right inverse, matrix exponential, condition number, Frechet derivative, inverse.
          [667167e] | 
      
        |  | ZHANG, Ruda | March 03, 2021: 
          Use mathcal for big O notation, to distinguish from the orthogonal group.
          [69caae9] | 
      
        |  | ZHANG, Ruda | June 17, 2020: 
          Formatting. More on manifolds: integral manifold, distribution, foliation; covariant derivative along curve in submanifold; higher-order retraction.
          [c08c622] | 
      
        |  | ZHANG, Ruda | June 12, 2020: 
          More on numerical analysis: Newton's method.
          [a6c383b] | 
      
        |  | ZHANG, Ruda | May 15, 2020: 
          More on pseudoinverse
          [bc7fd0b] | 
      
        |  | ZHANG, Ruda | May 02, 2020: 
          More on numerical analysis: Newton method; quasi-Newton methods; optimization; reference books.
          [67cbfe5] |