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I noticed there are a lot of empty webpage in Mathematica's website. Like this one at: https://mathworld.wolfram.com/AdjointMatrix.html

Is it only shown to paid users or it's simply empty? If it's actually empty, why put them online?

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    $\begingroup$ That page is not Mathematica documentation. The stuff on Wolfram MathWorld is more about the mathematics. If you want the adjoint use this: adj[m_] := Map[Reverse, Minors[Transpose[m], Length[m] - 1], {0, 1}] Table[(-1)^(i + j), {i, Length[m]}, {j, Length[m]}] The Mathematica documentation for Minors is here: reference.wolfram.com/language/ref/Minors.html $\endgroup$ – flinty Jun 19 '20 at 19:34
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    $\begingroup$ Note that: 1) that's not technically a Mathematica website, but Wolfram MathWorld. 2) That page is not completely empty (it has links to other pages). $\endgroup$ – MarcoB Jun 19 '20 at 19:34
  • $\begingroup$ Also for usage in Mathematica there is ResourceFunction["Adjugate"]. $\endgroup$ – Daniel Lichtblau Jun 20 '20 at 14:16
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I think mathworld.wolfram.com is not part of the official documentation and that there are placeholders at that site.

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  • $\begingroup$ Paul, might I recommend editing your answer to assuredly declare that it is not the documentation site, and perhaps provide the location of the actual site? $\endgroup$ – CA Trevillian Jun 21 '20 at 6:33

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