ocw.mit.edu
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MIT OpenCourseWare (OCW) provides free, openly accessible course materials from MIT, including lecture notes, assignments, exams, and video lectures. It spans many disciplines, with extensive math content that can support self-study on topics like embedding theorems.
More resources on Embedding Theorems
MathOverflow: Resources on Embedding Theorems
Practitioner discussions and book recs
nLab: Whitney Embedding Theorem
Comprehensive overview with references and proofs
mathworld.wolfram.com
MathWorld is an online comprehensive math encyclopedia from Wolfram, offering concise, well-structured articles on mathematical concepts, theorems, formulas, definitions, and visual illustrations. It includes entries on embedding theorems (e.g., Whitney, Nash, and isometric embeddings) with explanations, examples, and references.
ncatlab.org
nLab is a collaborative online wiki and reference focused on higher mathematics, especially category theory, higher category theory, and related fields like homotopy theory and type theory. It offers extensive, peer-curated entries, definitions, and discussions of concepts, theorems, and notation—including topics such as embedding theorems.