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- Closed set
- Closed star
- Closed subscheme
- Closed system of elements (functions)
- Closure condition
- Closure of a computational algorithm
- Closure of a set
- Closure operator
- Closure relation
- Closure space
- Clothoid
- Cluster processes
- Cluster set
- Co-Euclidean space
- Co-H-space
- Co-algebra
- Co-basis
- Co-equalizer
- Co-initial set
- Co-module
- Co-planar vectors
- Co-pseudo-Euclidean space
- Co-pseudo-Galilean space
- Co-triple
- Coadjoint representation
- Coalition
- Coalitional game
- Coarea formula
- Coarse graining
- Cobb-Douglas function
- Cobb–Douglas function
- Cobol
- Cobordism
- Cobordism h-
- Cobordism of knots
- Cochain
- Cochleoid
- Cocktail party graph
- Cocycle
- Cocyclic group
- Code
- Code with correction of arithmetical errors
- Code with correction of deletions and insertions
- Codimension
- Codimension-two bifurcations
- Coding, alphabetical
- Coding and decoding
- Codomain
- Coefficient
- Coefficient of variation
- Coefficient problem
- Coercive boundary value problem
- Coerciveness inequality
- Cofactor
- Cofibration
- Cofinal set
- Cofinality
- Cofinite subset
- Cofinite topology
- Cograph
- Cohen-Macaulay ring
- Cohen–Macaulay ring
- Coherent algebra
- Coherent algebraic sheaf
- Coherent analytic sheaf
- Coherent numbers
- Coherent ring
- Coherent sheaf
- Coherent space
- Coherent states
- Cohn-Vossen transformation
- Cohomological dimension
- Cohomology
- Cohomology functor
- Cohomology group
- Cohomology manifold
- Cohomology of Banach algebras
- Cohomology of Lie algebras
- Cohomology of a complex
- Cohomology of algebras
- Cohomology of groups
- Cohomology operation
- Cohomology ring
- Cohomology sequence
- Cohomotopy group
- Cokernel
- Collapsibility
- Collection-wise normal space
- Collinear vectors
- Collineation
- Collocation method
- Colombeau generalized function algebras
- Colon
- Combination
- Combinatorial analysis
- Combinatorial geometry
- Combinatorial geometry(2)
- Combinatorial mathematics
- Combinatorial topology
- Combinatorics
- Combinatory logic
- Combustion theory
- Comeager set
- Comitant
- Commensurable and incommensurable magnitudes
- Communication channel
- Commutant lifting theorem
- Commutation and anti-commutation relationships, representation of
- Commutative Banach algebra
- Commutative algebra
- Commutative group
- Commutative group scheme
- Commutative ring
- Commutativity
- Commutator
- Commutator subgroup
- Commuting operators
- Compact-open topology
- Compact extension
- Compact group
- Compact lattice element
- Compact mapping
- Compact operator
- Compact set, countably
- Compact space
- Compact space, countably
- Compactification
- Compactly continuous map
- Compactly generated
- Compactly generated space
- Compactness
- Compactness, countable
- Compactness principle
- Compactum
- Compactum T2-
- Companion matrix
- Companion polynomial
- Comparability graph
- Comparability of cardinals
- Comparison criterion of convergence
- Comparison function
- Comparison of tests in large samples
- Comparison of topologies
- Comparison theorem
- Comparison theorem (algebraic geometry)
- Compatibility of summation methods
- Compatible distributions
- Complementary graph
- Complementary series (of representations)
- Complementation
- Complemented lattice
- Complete Dedekind lattice
- Complete Riemannian space
- Complete accumulation point
- Complete algebraic variety
- Complete analytic function
- Complete bipartite graph
- Complete curvature
- Complete differential
- Complete graph
- Complete group
- Complete instability
- Complete integral
- Complete lattice
- Complete measure
- Complete metric space
- Complete multipartite graph
- Complete operator
- Complete probability formula
- Complete problem of eigen values
- Complete set
- Complete set of functionals
- Complete space
- Complete system
- Complete system of functions
- Complete system of residues
- Complete topological space
- Complete uniform space
- Complete variation of a function
- Completely-continuous operator
- Completely-integrable differential equation
- Completely-reducible matrix group
- Completely-reducible module
- Completely-reducible set
- Completely-regular semi-group
- Completely-regular space
- Completely-simple semi-group
- Completely distributive lattice
- Completely reducible group
- Completeness (in logic)
- Completeness (in topology)
- Completion
- Completion, MacNeille (of a partially ordered set)
- Completion method
- Completion of a uniform space
- Complex
- Complex (in homological algebra)
- Complex conjugate
- Complex conjugation
- Complex integration, method of
- Complex manifold
- Complex moment problem, truncated
- Complex number
- Complex of lines
- Complex space
- Complex structure
- Complex system
- Complex torus
- Complexification of a Lie algebra
- Complexification of a Lie group
- Complexification of a vector space
- Complexity function
- Complexity theory
- Component of a space
- Component of a vector
- Composite function
- Composite hypothesis
- Composite ideal
- Composite number
- Composition
- Composition (combinatorics)
- Composition sequence
- Composition series
- Compositum
- Compression
- Computable function
- Computable invariant
- Computable real number
- Computational algorithm
- Computational complexity classes
- Computational geometry
- Computational mathematics
- Computer, abstract
- Computer algebra package
- Concatenation
- Concave and convex operators
- Concave function
- Concentration function
- Conchoid
- Concorcet, Marquis de
- Condensation point
- Condensation point of a set
- Condensing operator
- Condition number
- Conditional convergence
- Conditional density
- Conditional distribution
- Conditional extremum
- Conditional mathematical expectation
- Conditional probability
- Conditional stability
- Conditionally-complete lattice
- Conditionally-periodic function
- Conditionally-periodic motion
- Condorcet jury theorem
- Condorcet paradox
- Conductor of a character
- Conductor of an Abelian extension
- Conductor of an integral closure
- Cone
- Cone condition
- Confidence bounds
- Confidence estimation
- Confidence interval
- Confidence level
- Confidence probability
- Confidence set
- Configuration
- Confluent analysis
- Confluent hypergeometric equation
- Confluent hypergeometric function
- Confocal conics
- Confocal curves
- Conformal-differential geometry
- Conformal-geodesic net
- Conformal Euclidean space
- Conformal connection
- Conformal geometry
- Conformal invariants
- Conformal mapping
- Conformal mapping, boundary properties of a
- Conformal measure
- Conformal radius of a domain
- Conformal space
- Conformal structure
- Conformal transformation
- Conformally-invariant metric
- Congruence
- Congruence (in algebra)
- Congruence equation
- Congruence in geometry
- Congruence modulo a double modulus
- Congruence modulo a prime number
- Congruence of lines
- Congruence problem
- Congruence subgroup
- Congruence subgroup problem
- Congruence with several variables
- Congruent matrices
- Conic
- Conic sections
- Conical net
- Conical surface
- Conjugacy class
- Conjugate class of functions
- Conjugate cone
- Conjugate directions
- Conjugate elements
- Conjugate function
- Conjugate gradients, method of
- Conjugate harmonic functions
- Conjugate isothermal coordinates
- Conjugate net
- Conjugate trigonometric series
- Conjugation
- Conjunction
- Conjunctive normal form
- Conley index
- Connected component
- Connected component of the identity
- Connected set
- Connected space
- Connected sum
- Connectedness and disconnectedness
- Connection
- Connection form
- Connection number
- Connection object
- Connections on a manifold
- Connectivity
- Connes-Moscovici index theorem
- Connes–Moscovici index theorem
- Connex
- Conoid
- Conormal
- Consecutive k out of n-system
- Consistency
- Consistent estimator
- Consistent test
- Constant
- Constant curvature, space of
- Constant width, body of
- Constant width, curve of
- Constrained optimization problem
- Constructible set