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CW complex
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===Relative CW complexes=== Roughly speaking, a ''relative CW complex'' differs from a CW complex in that we allow it to have one extra building block that does not necessarily possess a cellular structure. This extra-block can be treated as a (β1)-dimensional cell in the former definition.<ref>{{cite book |last1=Davis |first1=James F. |title=Lecture Notes in Algebraic Topology |last2=Kirk |first2=Paul |date=2001 |publisher=American Mathematical Society |location=Providence, R.I.}}</ref><ref>{{Cite web |title=CW complex in nLab |url=https://ncatlab.org/nlab/show/CW+complex}}</ref><ref>{{Cite web |title=CW-complex - Encyclopedia of Mathematics |url=https://www.encyclopediaofmath.org/index.php/CW-complex}}</ref>
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