..R

range
 the area over which a thing is distributed
  of a relation (in set theory) 
 the set of elements or values which are related to some other element under the relation

rational
 based on reason

rational number
 a number which is either zero or the ratio of two nonzero whole numbers
 see also:
 hyperrational

rationalist
 one who emphasises the role of reason in the justification of knowledge.

real

not imaginary

real number

the limit of a convergent sequence of rationals

realism
 belief in objective existence, often relative to some type of entity

recursive
 involving selfreference
 (in computer science and logic)
 a definition of a function or procedure is recursive if it involves reference to the function or procedure being defined, i.e. if during evaluation the function or procedure may invoke itself (usually with different arguments).
 recursive function (logic)
 a recursive function is one which is effectively computable, whose evaluation always terminates with a result.
 recursive set (logic)
 a set is recursive if the question of membership in the set is effectively decidable.
 recursively enumerable (logic)
 a set is recursively enumerable if there is an effective procedure for enumerating the members of the set.
Equivalently, if its membership question is semidecidable.
 regular
 conforming to a standard, complete, thorough, absolute
 regular ordinal
 an ordinal is regular if it is a limit ordinal whose cofinality, cf(), is .

rhetoric
 the art of effective or persuasive speaking or writing

relation
 what one person or thing has to do with another
 (logic, set theory)
 a correspondence between two sets (say A, B) represented by a set of ordered pairs, each containing one element from A and one from B.

reify
 convert into a thing, materialise
 (computing, formal methods)
 to realise an abstract specification as an executable program
 see also:
 hypostasis

representative
 consisting of elected deputies
 representative democracy
 a democracy in which government effected by elected representatives of the people
 see also:
 participatory democracy

rigid
 inflexible, strict
 rigid designator
 a name or description which designates the same object in every possible world
 nonrigid designator
 a designator which is not rigid
 see also:
 strongly rigid designator
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created 1994922 modified 2002102