Notes on Differential Equations (English Edition)

Informal but serious introduction to important models using ordinary and partial differential equations, based on the author's lectures on engineering mathematics at the freshman and sophomore level. Assumes calculus and some multivariable calculus, and discusses complex numbers, power and Fourier series, and numerical methods,
but the focus is on logistic model, heat conduction, waves, drum vibrations, spring and mass oscillations, conservation laws in fluid mechanics and other models.