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Discrete Math Final Definations
mcann
82
Mathematics
Undergraduate 2
12/09/2010

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Term
Addition Principle
Definition
n1+n2+...nt tasks
Term
Argument
Definition
connected series of statements to establish a definite proposition
Term
Bound Variable
Definition
a variable that is quantified
Term
Cartesian Product
Definition
x two sets A and B is the set of all ordered pairs of (a,b) such that a member B b member A
Term
Compound proposition
Definition
Combination of multiple propositions.
Term
Congruent modulo
Definition
a%m= b%m or m|(a-b)
Term
Contingency
Definition
Proposition that is neither a tautology or a contradiction
Term
Contradiction
Definition
Proposition that always evaluates to false
Term
Contraposition
Definition
p->q not q -> not p
Term
Converse
Definition
p->q q->p
Term
Corollary
Definition
Theorem who's truth follows directly from an accepted theorem
Term
Deductive Argument
Definition
Moves from accepted general principals to specific situation.
Term
Discrete Mathematics
Definition
encompasses the representation and study of collections of distinct objects
Term
Disjoint set
Definition
Intersection is the empty set
Term
Domain of Discourse
Definition
A collection of values from which a variable's value is drawn
Term
Fallacy
Definition
Argument constructed with improper inference.
Term
GCD
Definition
Largest integer such that i|x and i|y
Term
Horn Clause
Definition
Disjunction of predicates in which at most one of the predicates is not negated
Term
Identity Matrix
Definition
In is a nxn with ones down main diagonal
Term
Inductive Argument
Definition
Moves from specific observations to a general conclusion.
Term
Inverse
Definition
p -> q is not p -> not q
Term
LCM
Definition
smallest integer such that x|s and y|s
Term
Lemma
Definition
simple theorem whose truth is used to construct more complex theorems
Term
Logically Equivalent
Definition
Both propositions evaluate to the same result when presented with the same input
Term
Mathematical Logic
Definition
The use of formal languages and grammars to represent the syntax and semantics of computation.
Term
Multiplication Principle
Definition
S steps with n1 ways first n2 second etc. then n1*n2...ns ways to complete
Term
Ordered pair
Definition
Set of two items (a,b) (a,b) not equal (b,a) unless a=b
Term
Partition of a set
Definition
Separates its members into disjoint sets
Term
Philosophical Logic
Definition
The classical notion of 'logic' The study of thought and reasoning.
Term
Pigeonhole principle
Definition
n items in k boxes then one box has ceiling (n/k) items
Term
Power set
Definition
Set of all of A's subset including empty set.
Term
Predicate
Definition
A statement that includes one or more variables and will evaluate to either true or false when the variables are assigned values
Term
Proof
Definition
sound argument that establishes the truth of a theorem
Term
Proposition / statement
Definition
is a claim that is either true or false with respect to an associated context
Term
Sequence
Definition
Ordered range of a function from a set of integers to a set S.
Term
Set
Definition
Unordered collection of unique objects
Term
Simple proposition
Definition
A proposition that contains no logical operators.
Term
Sound argument
Definition
Valid argument that has true premises
Term
Specious Reasoning
Definition
Unsupported or improperly constructed argument
Term
Subset
Definition
A is a ███▐█ B if every member of A can be found in B
Term
Symmetric matrix
Definition
A = A^T
Term
Tautology
Definition
Proposition that always evaluates to true
Term
Transposition of matrix
Definition
Denoted A^T mxn = nxm rows and columns exchanged.
Term
Unbound variable
Definition
unquantified variable
Term
Valid Argument
Definition
Conclusion must follow from the hypothesis
Term
Well Formed Formula
Definition
A correctly structured expression of a language.
Term
Y
Definition
Codomain of f
Term
algorithm
Definition
set of instructions for performing a task
Term
arithmetic sequence
Definition
constant called common difference
Term
basis
Definition
trivial case handling
Term
bijective
Definition
injective and surjective
Term
composite
Definition
p>=2 and p is not prime
Term
composition
Definition
f o g h = f(g(x))
Term
conjecture
Definition
statement with unknown truth value
Term
countable
Definition
finite or countable infinite
Term
countable infinite
Definition
bijective mapping is to either of the sets Z* or Z+
Term
domain of f
Definition
X
Term
equivalence relation
Definition
reflexive symmetric and transitive
Term
factor
Definition
i and j positive integers. i %j = 0
Term
finite set
Definition
bijective mapping between it and set of cardinality n
Term
function
Definition
f: X -> Y is a relation from X to Y.
Term
geometric sequence
Definition
gn+1/gn common ratio
Term
image
Definition
f(n) = p
p is image
n is preimage
Term
increasing sequence (non decreasing)
Definition
in <= in+1
Term
inductive
Definition
complex problems are handled in terms of simplier versions
Term
injective
Definition
f(x) = y for at most one member of X
Term
irreflexive partial order
Definition
reflexive, antisymmetric and transitive
Term
mapping
Definition
f maps X to Y
Term
matrix
Definition
n-Dimensional collection of values
Term
partial order
Definition
reflexive, antisymmetric and transitive
Term
permutation
Definition
ordering of n distinct elements
Term
prime
Definition
only factors are 1 and then number also number > 2
Term
proper subset
Definition
a is ███ B A is a subset of B and A not equal B
Term
r-permutation
Definition
ordering of r-elemtn subset of n distinct elements
Term
range of f
Definition
set of all images of elements of X
Term
recursive definition
Definition
basis, inductive and sometimes external clause
Term
strictly decreasing
Definition
in> in+1
Term
strictly increasing sequence
Definition
in < in+1
Term
string
Definition
continuous finite sequence of zero or more elements of x are found within y in the same relative order.
Term
surjective
Definition
f's range is Y (range=codomain)
Term
theorem
Definition
Conjecture that is shown to be true
Term
total order
Definition
every pair of elements a,b are comparable
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