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Kepler–Poinsot polyhedron
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===Conway's operational terminology=== [[John Horton Conway|John Conway]] defines the Kepler–Poinsot polyhedra as ''greatenings'' and ''stellations'' of the convex solids.<br> In his [[Stellation#Naming stellations|naming convention]], the [[small stellated dodecahedron]] is just the ''stellated dodecahedron''. {| class="wikitable" | icosahedron (I) | dodecahedron (D) |- | great dodecahedron (gD) | stellated dodecahedron (sD) |- | great icosahedron (gI) | great stellated dodecahedron (sgD = gsD) |} ''Stellation'' changes pentagonal faces into pentagrams. (In this sense stellation is a unique operation, and not to be confused with the more general [[stellation]] described below.) ''Greatening'' maintains the type of faces, shifting and resizing them into parallel planes. {| class="wikitable collapsible collapsed" style="text-align: center;" !colspan="7"| Conway relations illustrated |- |- ! diagram | [[File:Relationship among regular star polyhedra (green and violet).png|450px]] <small><br>The polyhedra in this section are shown with the same [[midsphere|midradius]].</small> |- !style="color:#e57500"| stellation | {| | {{multiple image | align = right | width = 200 | image1 = Skeleton 12, size s.png | caption1 = <span style="color: #a13870;">'''D'''</span> | image2 = Skeleton St12, size s.png | caption2 = <span style="color: #a13870;">'''sD'''</span> }} | {{multiple image | align = right | width = 200 | image1 = Skeleton Gr12, size s.png | caption1 = <span style="color: #007400;">'''gD'''</span> | image2 = Skeleton GrSt12, size s.png | caption2 = <span style="color: #007400;">sgD = '''gsD'''</span> }} |} |- !style="color:#00a7e1"| greatening | {| style="width: 100%;" | [[File:Skeleton pair 12 and greatening, size s.png|thumb|center|200px|<span style="color: #a13870;">'''D'''</span> and <span style="color: #007400;">'''gD'''</span>]] | [[File:Skeleton pair 20 and greatening, size s.png|thumb|center|200px|<span style="color: #007400;">'''I'''</span> and <span style="color: #a13870;">'''gI'''</span>]] | [[File:Skeleton pair St12 and greatening, size s.png|thumb|center|200px|<span style="color: #a13870;">'''sD'''</span> and <span style="color: #007400;">'''gsD'''</span>]] |} |- !style="color:#00cb00"| duality | {| style="width: 100%;" | [[File:Skeleton pair 12-20, size s.png|thumb|center|200px|<span style="color: #a13870;">'''D'''</span> and <span style="color: #007400;">'''I'''</span>]] | [[File:Skeleton pair Gr12 and dual, size s.png|thumb|center|200px|<span style="color: #007400;">'''gD'''</span> and <span style="color: #a13870;">'''sD'''</span>]] | [[File:Skeleton pair Gr20 and dual, size s.png|thumb|center|200px|<span style="color: #a13870;">'''gI'''</span> and <span style="color: #007400;">'''gsD'''</span>]] |} |}
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