FREE Math Book. 375 pages.
"Tea Time Numerical Analysis" by Brin. The material is presented "as if it were being told to a student during tea time at University... The exercises are plentiful and well-designed, and many of them have extensive solutions. The necessary terms and definitions and theorems and examples will be woven into a more conversational style. My hope is that this blend of formal and informal mathematics will be easier to digest, and dare I say, students will be more invited to do their reading in this format."
Contents
Preliminaries
Root Finding
Interpolation
Numerical Calculus
More Interpolation
Ordinary Differential Equations
Link: lqbrin.github.io/tea-time-nu…
ALT The most general Ruijsenaars-van Diejen-Takemura Hamiltonians are characterized as Heun operators defined as second order q-difference operators with a raising action on elementary rational functions with poles on the Askey-Wilson grid.