Editing Laws of Form (section)

===Syntax===
Given any valid primary arithmetic expression, insert into one or more locations any number of Latin letters bearing optional numerical subscripts; the result is a primary algebra [[formula]]. Letters so employed in [[mathematics]] and [[logic]] are called [[Variable (mathematics)|variables]]. A primary algebra variable indicates a location where one can write the primitive value [[Image:Laws of Form - cross.gif]] or its complement [[Image:Laws of Form - double cross.gif]]. Multiple instances of the same variable denote multiple locations of the same primitive value.