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notebooks - Why MMA cannot apply the correct style of unit?



When I select


Style-> Style-> DisplayFormulaNumbered



enter image description here



Then I type some formula show as below:



enter image description here



I found that the font of formula is not Times New Roman,so I select the unit ,then select Style->Font, which shows that the font of formula is courier new.



Question


How to revise this condtion? or is it the default style of DisplayFormulaNumbered



Update


Thanks for Sjoerd C. de Vries's solution.


When I select



  • Format > StyleSeet > Book > Textbook


then I select




  • Format > Style > EquationNumbered


Lastly, I input some formula shown as below (it show the correct formula style)



enter image description here



I looked up the definition of EquationNumbered,then I found a difference DefaultFormatType -> TraditionalForm



So I execute some operations as below





  • Format > StyleSeet > Default




  • Format > Edit StyleSeet




  • copying the DisplayFormulaNumbered style definitions from the Default.nb parent





  • enter image description here




However, the result of formula remains keep the font of courier new.


enter image description here



Answer



The problem is that the way it has been configured DisplayFormula creates cells with the structure Cell[BoxData[...],...] whereas what you preferably want (IMO) for displaying formaulas is Cell[TextData[...],...].


So the first step would be to make this change to your private stylesheet:


DefaultFormatType->DefaultTextFormatType,


or you could also make the cell style inherit from the Text style:


Cell[StyleData["DisplayFormula",StyleDefinitions -> StyleData["Text"]],
 CellMargins->{{66, Inherited}, {Inherited, Inherited}},
 StripStyleOnPaste->True,
 DefaultFormatType->DefaultTextFormatType,
 HyphenationOptions->{"HyphenationCharacter"->"\[Continuation]"},
 LanguageCategory->"Formula",
 ScriptLevel->0,
 SingleLetterItalics->True,

 MenuSortingValue->1700,
 FontFamily->"Times",
 FontSize->14,
 FontColor->GrayLevel[0.2],
 UnderoverscriptBoxOptions->{LimitsPositioning->True}]

IMO the default input style formatting is an oversight or error given that this cell style is almost always used for, or to try and obtain, traditional form text formatting. In the screen grab below you can see on top a cell created with the default DisplayFormula style which has an underlying Cell[BoxData[ ... structure. After editing the stylesheet you create a new cell and begin typing and you have a Cell[TextData... structure (equation below).


enter image description here


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