Terminologies

lhs : Left Hand Side

rhs : Right Hand Side

p = q : an identity

Equational Expression: expr1 = expr2 e.g. expr1 = a*x+b and expr2 = cos[b-c]

copy: when an object is duplicated, byte by byte so to say, into a facsimile.

This definition of copy is the simplest to grasp the concept. In due places, more sophisticated definitions will be produced.

Structure: a structure is that which permitting Similarity to other Similars.

Example: Circular is a structure since it permits similarity to anything that is round.

Example: Red is a structure since it permits similarity to anything that is red.

Example: Numeral is a structure since it permits similarity to anything that is a number.

ff calls a list e.g. {1,2,3} as a structure, or a function e.g. cos[ ] a structure or an algebraic structure e.g. x^2-1.