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Try doing some basic maths questions in the Lean Theorem Prover. Functions, real numbers, equivalence relations and groups. Click on README.md and then on "Open in CoCalc with one click".

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License: APACHE
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import itertools

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import sys

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for line in sys.stdin:

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    sys.stdout.write(line)

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    if 'error' in line:

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        for line in itertools.islice(sys.stdin, 20):

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            sys.stdout.write(line)

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        sys.exit(1)

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