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Questions about how Mathematica evaluates expressions, tracing evaluation (Trace*), handling expressions in unevaluated form (Hold*, Unevaluated), nonstandard evaluation, etc.

5 votes
3 answers
345 views

First evaluation fails

The problem is that each time I make a change to the function nCk the first evaluation doesn't print. I have to stop the evaluation and then start it again to see the result of my change. …
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