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→Polytopes
==Polytopes==
==Polytopes==
'''<font color="#ff8000">多面体 Polytopes</font>'''
'''<font color="#ff8000">多面体 Polytopes</font>'''<br>
In a similar manner, the relationship between cells whose dimensions differ by one in a polytope, can be represented by an incidence matrix.<ref>{{citation|first=H.S.M.|last=Coxeter|author-link=Coxeter|title=[[Regular Polytopes (book)|Regular Polytopes]]|year=1973|edition=3rd|origyear=1963|publisher=Dover|isbn=0-486-61480-8|pages=[https://archive.org/details/regularpolytopes0000coxe/page/166 166-167]}}</ref>
In a similar manner, the relationship between cells whose dimensions differ by one in a polytope, can be represented by an incidence matrix.<ref>{{citation|first=H.S.M.|last=Coxeter|author-link=Coxeter|title=[[Regular Polytopes (book)|Regular Polytopes]]|year=1973|edition=3rd|origyear=1963|publisher=Dover|isbn=0-486-61480-8|pages=[https://archive.org/details/regularpolytopes0000coxe/page/166 166-167]}}</ref>
以类似的方式，在多面体中尺寸相差一个的细胞之间的关系可以由关联矩阵表示。
以类似的方式，在多面体中尺寸相差一个的细胞之间的关系可以由关联矩阵表示。
==Block designs==
==Block designs==