[anthk]

Lots of software doesn't run on a computer.

[tmtvl]

Do you mean written down code? I think that deciding whether that's software is debatable. Other than that I can't think of anything that doesn't run on a computer that can be called software. Unless you want to be pedantic and say 'this program doesn't run on a computer, it gets compiled down into machine code. The machine code runs on a computer.'

[CRConrad]

So what?

* Bad instructions that the computer can't execute are still instructions for the computer to execute, they're just bad ones.

* And if they're only printed in a textbook and never actually entered into a code editor, they exist only on the printed page.

So what you said doesn't invalidate the GP in the slightest.