You might like his work "Elementary Algebra:" http://www.softwarepreservation.org/projects/apl/Papers/ElementaryAlgebra http://www.softwarepreservation.org/pro

You might like his work "Elementary Algebra:" http://www.softwarepreservation.org/projects/apl/Papers/ElementaryAlgebra http://www.softwarepreservation.org/projects/apl/Papers/Elem...