ncatlab.org
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nLab (ncatlab.org) is an online collaborative knowledge base for advanced mathematics and related fields, featuring extensive, peer-edited articles on category theory, homotopy theory, higher algebra, and more. It includes detailed entries on simplicial objects and simplicial complexes, with definitions, examples, discussions, and cross-links to related concepts.
More resources on Simplicial Complexes
nLab: Simplicial Complex
Comprehensive reference with category-theoretic perspective
Hatcher's Algebraic Topology
Free book and resources on simplicial complexes and more
Algebraic Topology
Learn simplicial complexes with N J Wildberger's Algebraic Topology course! Explore this fascinating area of math.
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia from Wolfram, offering detailed, hyperlinked articles on a wide range of topics. Each entry provides definitions, theorems, formulas, examples, and diagrams—covering concepts like simplicial complexes, triangulations, topology, and related areas.
ocw.mit.edu
MIT OpenCourseWare provides free, openly accessible MIT course materials—lectures, notes, assignments, and exams—from a wide range of subjects. It includes math and topology resources where you can find lecture materials and problem sets related to simplicial complexes.