Basic Stochastic Processes -

: The book is "interlaced" with numerous exercises that are essential to the learning path, rather than just optional practice.

by Durrett: Recommended for a solid grounding in martingales, Markov chains, and Brownian motion. Basic Stochastic Processes

: Probability theory (random variables, expectation, laws of large numbers) and calculus. : The book is "interlaced" with numerous exercises

: You can find it at retailers like Walmart or Barnes & Noble . Alternative "Deep" Resources : You can find it at retailers like

by Pierre Devolder: Focuses on stochastic calculus, Lévy processes, and the Black-Scholes model. Ideal for actuaries or risk managers. Available at Barnes & Noble . For Rigorous Mathematical Theory

Depending on your specific goals (finance, engineering, or pure theory), these texts offer different depths: For Financial & Actuarial Depth

by Bruce Hajek: A highly-regarded free resource for engineering students.