MTMathAtom(type: MTMathAtomType, nucleus: String)
A MTMathAtom is the basic unit of a math list. Each atom represents a single
character
or mathematical operator in a list. However certain atoms can represent more complex structures
such as fractions and radicals. Each atom has a type which determines how the atom is rendered
and
a nucleus. The nucleus contains the character(s) that need to be rendered. However the nucleus
may
be empty for certain types of atoms. An atom has an optional subscript or superscript which
represents
the subscript or superscript that is to be rendered.
Certain types of atoms inherit from MTMathAtom and may have additional fields.