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Many built-in functions are open source too. Use the "PrintDefinitions" ResourceFunction to see the code of functions that are implemented in Wolfram Language i

• mkl 7mo ago
  Source available? The license is still proprietary, right?
  • LegionMammal978 7mo ago
    Yes, it is all proprietary, but there are still ways to inspect most of the WL-implemented functions since the system does not go to extreme pains to keep them hidden from introspection. It is not unlike Maple in that sense.
    • oh_my_goodness 7mo ago
      Yeah, hiding the recipes for how the math is really done would make the whole system kinda guess-and-hope for serious users.