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From clean kernel, when typing 

 result = Reduce[2 d^2 == -((2*(1 + d) + ((4 d^3)/(1 - d)))*(d - 1)),d]

Here what version 12 displays on the screen, compared to version 11.3

Mathematica graphics

Compare to 11.3

Mathematica graphics

I want 12 to display the result like 11.3 did. I know I can apply InputForm to the result of 12 to make it display like 11.3, but I do not want to do this each time.

I tried to search options inspector, but not sure what to look for.

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  • 6
    $\begingroup$ This behavior is the single change in version 12 I most dislike. (Same thing happens with Solve, of course.) The default output obfuscates the distinction between exact solutions with numerical approximations. While engineers and other "practical" folks may like the new behavior, I really see no good rationale, and a discrepancy the way even version 12 leaves other irrational quantities as exact expressions. $\endgroup$
    – murray
    Commented Jun 13, 2019 at 19:42
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    $\begingroup$ SetSystemOptions[ "TypesetOptions" -> "NumericalApproximationForms" -> False] $\endgroup$
    – ilian
    Commented Jun 13, 2019 at 19:43
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    $\begingroup$ The option inspector is for FrontEnd options, while the typesetting is the kernel's responsibility here. This command could be placed in the kernel's init.m file if you would like to be executed automatically every time. $\endgroup$
    – ilian
    Commented Jun 13, 2019 at 19:54
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    $\begingroup$ @murray I'm probably in the "practical folks" category, and I still hate this change. It also seems to me that it confuses beginners more than it helps them. $\endgroup$
    – Szabolcs
    Commented Jul 26, 2019 at 15:19
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    $\begingroup$ I like the fact that Root can be displayed more compactly like this, but I think the design could have been way better. I'd much prefer some kind of elided TraditionalForm polynomial and a number on the right. i.e. just take the original form and make it more compact. $\endgroup$
    – b3m2a1
    Commented Jul 26, 2019 at 15:21

1 Answer 1

Reset to default
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Making the comments into an an answer as suggested.

SetSystemOptions[ "TypesetOptions" -> "NumericalApproximationForms" -> False]

will restore the legacy typesetting for Root and AlgebraicNumber.

This command could be placed in the kernel's init.m file if you would like to be executed automatically every time. (The option inspector is for FrontEnd options)

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  • $\begingroup$ Can I configure it to show more decimal digits in iconized form? $\endgroup$
    – Vladimir Reshetnikov
    Commented Jul 21, 2022 at 19:24

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