Schläfli symbol

In four dimensions, the symbol {p,q,r} represents that there are r 3-dimensional faces about each edge that are polyhedra with symbol {p,q}. The 4-dimensional regular polytopes are {3,3,3} pentatope, {3,3,4} orthoplex, {4,3,3} tesseract, {3,4,3} octaplex, {5,3,3} dodecaplex, and {3,3,5} tetraplex. Here the tesseract and pentatope are the 4-dimensional hypercube and simplex respectively; in n dimensions, the hypercube and simplex have symbols {4,3,3,…,3} and {3,3,…,3}.

• tetrahedral number
• tetrahedron
• TeX
• t-formulae
• Thales of Miletus
• theorem
• Theorema Egregium
• theorem proving
• there exists
• theta function
• Thom, René Frédéric
• Thomson, William
• three-body problem
• three-door problem
• thrust
• tie
• tiling
• time
• time dilation
• time series
• Tn
• Tonelli's theorem
• tonne
• topological data analysis
• topological group