. "Mathcad is computer software primarily intended for the verification, validation, documentation and re-use of engineering calculations. First introduced in 1986 on DOS, it was the first to introduce live editing of typeset mathematical notation, combined with its automatic computations."@en . . "2013-10-01Z"^^ . "Active" . . . . . . "Mathcad"@en . . "15.0; Prime 3.0" .