John calls Computer Science for Computer-maths because he doesn't think it is a science, but according to him it is a trade. Every time he refers to people who, like Merlin did in a previous phase of his life, work with building websites or do programming, he will call them computer-maths people. John has received quite some feedback over the years from Computer Science people who didn't like John's categorization of their field.

There was a longer discussion about this in Episode 155

This bit is used very often, for example here:

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