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Many functions source ate viewable. Use https://resources.wolframcloud.com/FunctionRepository/resources/PrintDefinitions https://resources.wolframcloud.com/Fun

• gdelfino01 7mo ago
  Many built-in functions are open source too. Use the "PrintDefinitions" ResourceFunction to see the code of functions that are implemented in Wolfram Language itself.
  • 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.