(graph theory) The number of vertices in a minimum vertex cover of a graph, often denoted as 𝜏=𝜏(G).

(graph theory) the number of vertices in a minimum dominating set of a given graph, often denoted as 𝛾=𝛾(G)

(physics) A Reynolds number at which the flow of a fluid changes from laminar to turbulent.

simple past tense and past participle of numb

plural of number line

(mathematics) A line that graphically represents the real numbers as a series of points whose distance from an origin is proportional to their value

(topology, algebraic topology) Any of a sequence of numbers, denoted bₙ, which characterise a given topological space K by giving, for each dimension, the number of holes in K of said dimension; (formally) the rank of the nth homology group, Hₙ, of K.

(Canada) A nine-digit number issued by the government of Canada to citizens, permanent residents, and some categories of temporary residents, for official identification in the provision of government services and income taxation. Abbreviation: SIN.

(number theory) An element of a completion of the field of rational numbers with respect to a p-adic ultrametric.

plural of numbat