Merge branch 'main' into publish

book/_toc.yml

book/external/learn-programming

book/numerical_methods/1-revision-of-concepts.ipynb

book/numerical_methods/2-derivative.ipynb

book/numerical_methods/2-numerical-interp.ipynb

book/numerical_methods/3-fdm-introduction.ipynb

book/numerical_methods/3-taylor-series.ipynb

book/numerical_methods/4-FDM-intro.ipynb

book/numerical_methods/4-taylor-series-expansion.ipynb

book/numerical_methods/5-numerical-integration.ipynb

book/numerical_methods/5-numerical_derivatives.ipynb

...umerical_methods/6-initial-value-problem-singlestep.ipynb

book/numerical_methods/figs/NumericalMethodsRiver.gif

book/numerical_methods/figs/derivative_new.png

book/numerical_methods/figs/derivative_new2.png

book/numerical_methods/figs/derivative_ways.png

book/numerical_methods/figs/explicit_euler.png

book/numerical_methods/figs/finiteDifferenceMethodDomain.png

book/numerical_methods/figs/integral_illustration.png

book/numerical_methods/figs/left_riemann_new.png