Similar to 稠密部分加群
 - RE (計算複雑性理論)RE (complexity)
 - RemezのアルゴリズムRemez algorithm
 - Risa/Asir
 - RP (計算複雑性理論)RP (complexity)
 - RSA暗号RSA cryptosystem▲1 trends
 - Ryll-Nardzewskiの不動点定理Ryll-Nardzewski fixed-point theorem
 - SASTRAラマヌジャン賞SASTRA Ramanujan Prize
 - Scripta MathematicaScripta Mathematica
 - SIAM (学会)Society for Industrial and Applied Mathematics
 - Sinc関数Sinc function
 - SINGULAR (数式処理システム)Singular (software)
 - SL (計算複雑性理論)SL (complexity)
 - SLATECSLATEC
 - Small set (組み合わせ論)Small set (combinatorics)
 - Smn定理Smn theorem
 - SO(2)
 - SOR法Successive over-relaxation
 - SR1法Symmetric rank-one
 - Sum-free setSum-free set
 - SumsetSumset
 - SymPySymPy
 - SYZ予想SYZ conjecture
 - Séminaire de Géométrie Algébrique du Bois MarieSéminaire de Géométrie Algébrique du Bois Marie
 - S言語S (programming language)
 - Σ集合環Sigma-ring
 - T1空間T1 space
 - T0空間
 - The Mathematical GazetteThe Mathematical Gazette