CAS command question

[Han]

(01-06-2017 08:28 PM)DrD Wrote:  

(01-06-2017 06:57 PM)chromos Wrote:  This works:
lhs("(1/3)*x+(1/6)*y<=80")

Implicit multiplication was used as the test case. This is fair, because it's an example a student might encounter directly from a workbook problem. If you can find input workarounds, that is not quite the same thing. The debate hinges on what a left() or a lhs() command, should consistently return.

Except in some extremely simple cases, there is no implicit multiplication on the Prime. Your expression leads to an error when entered on the command line in CAS view all on its own. Feed it a valid expression and it works. You can place error traps if you want to make it more robust.