<mmultiscripts> - MathML 编辑

The MathML <mmultiscripts> element allows you to create tensor-like objects. In a descriptive way tensors are multidimensional matrices (mathematical imprecise but exemplified). The degree of a tensor depends on the dimensionality of a representative array. For example, a number is a 0-dimensional array, or a 0th-order tensor. A 1-dimensional array (e.g. vectors) is a 1st-order tensor and so 2nd-order tensors are needed to represent square matrices. To learn more about the mathematical background of tensors refer to the entry on Wikipedia.

MathML uses a special syntax to describe subscripts and superscripts for both, postscripts and prescripts, attached to a base expression:

<mmultiscripts>
    base
     (subscript superscript)*
     [ <mprescripts/> (presubscript presuperscript)* ]
</mmultiscripts>

After the base expression you can specify a postsubscript and a postsuperscript. Prescripts are optional and are separated by the empty tag <mprescripts/> (only one <mprescripts /> element is allowed, otherwise you will get an DuplicateMprescripts error in the Error Console and "invalid-markup" in your rendering). In addition you are able to use <none/> as a placeholder for empty scripts (not for the base). See the examples section for a correct usage.

Attributes

class, id, style

Provided for use with stylesheets.

displaystyle

A Boolean value specifying whether more vertical space is used for displayed equations or, if set to false, a more compact layout is used to display formulas. The main effect is that larger versions of operators are displayed, when displaystyle is set to true. See also largeop and movablelimits on <mo>.

href

Used to set a hyperlink to a specified URI.

mathbackground

The background color. You can use #rgb, #rrggbb and HTML color names.

mathcolor

The text color. You can use #rgb, #rrggbb and HTML color names.

subscriptshift

The minimum space by which to shift the subscript below the baseline of the expression, as a CSS length.
This property is deprecated and will be removed in the future.

superscriptshift

The minimum space by which to shift the superscript above the baseline of the expression, as a CSS length.
This property is deprecated and will be removed in the future.

Examples

Using <mprescripts/>

Sample rendering:

Rendering in your browser: ${}_b{}^{a}X_d^c$

<math>

    <mmultiscripts>

        <mi>X</mi>      <!-- base expression -->

        <mi>d</mi>      <!-- postsubscript -->
        <mi>c</mi>      <!-- postsuperscript -->

        <mprescripts />
        <mi>b</mi>      <!-- presubscript -->
        <mi>a</mi>      <!-- presuperscript -->

    </mmultiscripts>

</math>

Using <none/>

Sample rendering:

Rendering in your browser: ${}_{b}X^c$

<math>

    <mmultiscripts>

        <mi>X</mi>      <!-- base expression -->

        <none />        <!-- postsubscript -->
        <mi>c</mi>      <!-- postsuperscript -->

        <mprescripts />
        <mi>b</mi>      <!-- presubscript -->
        <none />        <!-- presuperscript -->

    </mmultiscripts>

</math>

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• <msub> (Subscript)
• <msup> (Superscript)
• <msubsup> (Subscript-superscript pair)