grpn: grpn (graphical reverse polish notation (RPN) grpn: grpn: GRPN is written in C and uses the GIMP Toolkit (GTK) on top of X11. grpn: GRPN was developed under Linux but has also been tested under SunOS grpn: and Solaris. It should work with almost any UNIX, though. grpn: GRPN works with real numbers and complex numbers. Numbers can be grpn: displayed in 4 different radix modes, and complex numbers can be grpn: displayed in either Cartesian or polar form. GRPN uses a stack and grpn: reverse polish notation to evaluate expressions. The stack in GRPN is grpn: infinite and limited only by available memory. grpn: Homepage: http://lashwhip.com/grpn.html