ocw.mit.edu
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MIT OpenCourseWare is a free, publicly accessible repository of MIT course materials, including lecture notes, assignments, and exams from a wide range of classes. It offers resources from math and engineering courses on numerical linear algebra and iterative methods, providing self-paced content useful for learning Krylov Subspace Methods.
More resources on Krylov Subspace Methods
SciPy Sparse Linear Algebra
Practical Krylov solvers in Python
Yousef Saad's Software Page
Free implementations and notes on iterative/Krylov methods
mathworld.wolfram.com
MathWorld is Wolfram's comprehensive online mathematics encyclopedia, offering concise, detailed articles on topics across mathematics, including linear algebra and numerical methods such as Krylov subspace methods. Each entry provides definitions, formulas, explanations, and illustrative examples.
nptel.ac.in
NPTEL is an Indian online learning platform that hosts free video lectures and course materials from IITs and IISc across engineering and sciences. It offers structured online courses with lecture videos, notes, assignments, and certificates, covering a wide range of topics including numerical methods and Krylov subspace techniques.