Symbols:Abbreviations

= A =

AoC
The axiom of choice.

= B =

BNF
Backus-Naur Form (previously Backus Normal Form until the syntax was simplified by Peter Naur.

It was Donald Knuth who suggested the name change, on the grounds that "normal" is an inaccurate description.

= C =

CNF
Conjunctive normal form.

= D =

DNF
Disjunctive normal form.

= E =

EE
Context: Predicate Logic.

Rule of Existential Elimination, which is another term for the Rule of Existential Instantiation (EI).

EG
Context: Predicate Logic.

Rule of Existential Generalisation.

EI
Context: Predicate Logic.

Rule of Existential Instantiation.

Alternatively, Rule of Existential Introduction, which is another term for the Rule of Existential Generalisation (EG). Beware.

= F =

FCF
Finite continued fraction.

= G =

GCD or g.c.d.

 * Greatest common divisor. Also known as highest common factor (h.c.f.).

= H =

HCF or h.c.f.

 * Highest common factor. Also known as greatest common divisor (g.c.d.).

= I =

iff
"If and only if".

ICF
Infinite continued fraction.

I.V.P.

 * $$1:$$ The intermediate value property.


 * $$2:$$ An initial value problem.

= L =

LCM or l.c.m.
The lowest (or least) common multiple.

LHS
Left hand side.

In an equation:
 * $$\textrm {Expression}\ 1 = \textrm {Expression}\ 2$$

the term $$\textrm {Expression}\ 1$$ is the LHS.

= M =

mno
The minimal negation operator.

= N =

NNF
Negation normal form.

= O =

ODE
An ordinary differential equation.

= P =

PDE
A partial differential equation.

PGF or p.g.f.
Probability Generating Function.

PMF or p.m.f.
Probability mass function.

= R =

RHS
Right hand side.

In an equation:
 * $$\textrm {Expression}\ 1 = \textrm {Expression}\ 2$$

the term $$\textrm {Expression}\ 2$$ is the RHS.

= S =

SCF
Simple continued fraction.

SFCF
Simple finite continued fraction.

SICF
Simple infinite continued fraction.

= U =

URM
Unlimited Register Machine. An abstraction of a computing device with certain particular characteristics.

= W =

WFF
Well-formed formula.

WLOG
Without loss of generality.

Suppose there are several cases which need to be investigated.

If the same argument can be used to dispose of two or more of these cases, then it is acceptable in a proof to pick just one of these cases, and announce this fact with the words: Without loss of generality, ..., or just WLOG.

WRT
With respect to.

When performing calculus operations, i.e. differentiation or integration, one needs to announce which variable one is "working with".

Thus the phrase with respect to is (implicitly or explicitly) part of every statement in calculus.

Thus the abbreviation WRT or w.r.t. is frequently seen, and often pronounced something like wurt.

= Z =

ZF
Zermelo-Fraenkel Set Theory.

ZFC
Zermelo-Fraenkel Set Theory with the Axiom of Choice.