What is the executable file for cantor?

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You may want to be more specific about your question. Here are some resources on the web:

• Sage Wiki about Cantor
• Cantor website
• This ask.sagemath.org post

I'll assume two things. That kcrisman answer didn't help. And that your question is about setting cantor to use sage.

In short that you want to know what to put in the box in cantor to start sage. If PATH is the full path in which you installed sage then you need to put: PATH/sage