Template:Numbered block/doc

This template creates a numbered block which is usually used to number mathematical formulae. This template can be used together with {{EquationRef}} and {{EquationNote}} to produce nicely formatted numbered equations if a back reference to an equation is wanted.

Usage

{{Numbered block|<1>|<2>|<3>|RawN=<>|LnSty=<>|Border=<>}}

Parameters

Parameters |1=, |2=, and |3= of this template are required. In addition, there are three optional parameters |RawN=, |LnSty= and |Border=.

• |1=: Specify indentation. The more colons (:) you put, the further indented the block will be, up to a limit of 20. This parameter can be empty if no indentation is needed.
• |2=: The body or content of the block.
• |3=: Specify the block number.
• |RawN=: If a non-empty non-whitespace value, no extra formatting will be applied to the block number.
• |LnSty=: Specify the line style.
• |Border=: If set, put a box around the equation. (Experimental.)

Examples

Equations may render HTML
{{Numbered block|:|<math>y=ax+b</math>|Eq. 3}}	$y=ax+b$ Eq. 3
{{Numbered block|:|<math>ax^2+bx+c=0</math>|Eq. 3}}	$ax^{2}+bx+c=0$ Eq. 3
{{Numbered block|:|<math>\Psi(x_1,x_2)=U(x_1)V(x_2)</math>|2}}	$\Psi (x_{1},x_{2})=U(x_{1})V(x_{2})$ 2
Indentation
{{Numbered block||<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3.5}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ 3.5
{{Numbered block|:|<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|1}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ 1
{{Numbered block|::|<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|13.7}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ 13.7
{{Numbered block|:::|<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|1.2}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ 1.2
Formatting of equation number
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=3.5|RawN=.}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ 3.5
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<3.5>|RawN=.}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ <3.5>
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=[3.5]|RawN=.}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3='''[3.5]'''|RawN=.}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''[3.5]'''</Big>}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''[3.5]'''</Big>|RawN=.}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<math>(3.5)</math>|RawN=.}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ $(3.5)\,$
Line style
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''(3.5)'''</Big>|RawN=.|LnSty=1px dashed red}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ (3.5)
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''(3.5)'''</Big>|RawN=.|LnSty=3px dashed #0a7392}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ (3.5)
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''[3.5]'''</Big>|RawN=.|LnSty=3px solid green}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''[3.5]'''</Big>|RawN=.|LnSty=5px dotted blue}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''[3.5]'''</Big>|RawN=.|LnSty=0px solid green}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''[3.5]'''</Big>|RawN=.|LnSty=5px none green}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
{{Numbered block|1=:|2=<math>\mathbf{a}(t)=\frac{d}{dt}\mathbf{v}(t)</math>|3=<Big>'''[3.5]'''</Big>|RawN=.|LnSty=3px double green}}	$\mathbf {a} (t)={\frac {d}{dt}}\mathbf {v} (t)$ [3.5]
Line height and indentation (1)
The following equations :<math>3x+2y-z=1</math> :<math>2x-2y+4z=-2</math> :<math>-2x+y-2z=0</math> form a system of three equations.	The following equations $3x+2y-z=1$ $2x-2y+4z=-2$ $-2x+y-2z=0$ form a system of three equations.
The following equations {{Numbered block|:|<math>3x+2y-z=1</math>|1}} {{Numbered block|:|<math>2x-2y+4z=-2</math>|2}} {{Numbered block|:|<math>-2x+y-2z=0</math>|3}} form a system of three equations.	The following equations $3x+2y-z=1$ 1 $2x-2y+4z=-2$ 2 $-2x+y-2z=0$ 3 form a system of three equations.
The following equations <div style="line-height: 0;"> {{Numbered block|:|<math>3x+2y-z=1</math>|1}} {{Numbered block|:|<math>2x-2y+4z=-2</math>|2}} {{Numbered block|:|<math>-2x+y-2z=0</math>|3}} </div> form a system of three equations.	The following equations $3x+2y-z=1$ 1 $2x-2y+4z=-2$ 2 $-2x+y-2z=0$ 3 form a system of three equations.
The following equations <div style="line-height: 0;"> {{Numbered block||<math>3x+2y-z=1</math>|1}} {{Numbered block||<math>2x-2y+4z=-2</math>|2}} {{Numbered block||<math>-2x+y-2z=0</math>|3}} </div> form a system of three equations.	The following equations $3x+2y-z=1$ 1 $2x-2y+4z=-2$ 2 $-2x+y-2z=0$ 3 form a system of three equations.
The following equations <div style="line-height: 0; margin-left: 1.6em;"> {{Numbered block||<math>3x+2y-z=1</math>|1}} {{Numbered block||<math>2x-2y+4z=-2</math>|2}} {{Numbered block||<math>-2x+y-2z=0</math>|3}} </div> form a system of three equations.	The following equations $3x+2y-z=1$ 1 $2x-2y+4z=-2$ 2 $-2x+y-2z=0$ 3 form a system of three equations.
Line height and indentation (2)
The following equations :<math>3x+2y-z=1</math> ::<math>2x-2y+4z=-2</math> :::<math>-2x+y-2z=0</math> form a system of three equations.	The following equations $3x+2y-z=1$ $2x-2y+4z=-2$ $-2x+y-2z=0$ form a system of three equations.
The following equations <div style="line-height: 0; margin-left: 1.6em;"> {{Numbered block||<math>3x+2y-z=1</math>|1}} <div style="margin-left: 1.6em;"> {{Numbered block||<math>2x-2y+4z=-2</math>|2}} <div style="margin-left: 1.6em;"> {{Numbered block||<math>-2x+y-2z=0</math>|3}} </div> </div> </div> form a system of three equations.	The following equations $3x+2y-z=1$ 1 $2x-2y+4z=-2$ 2 $-2x+y-2z=0$ 3 form a system of three equations.
The following equations <div style="line-height: 0;"> <div style="margin-left: calc(1.6em * 1);"> {{Numbered block||<math>3x+2y-z=1</math>|1}} </div> <div style="margin-left: calc(1.6em * 2);"> {{Numbered block||<math>2x-2y+4z=-2</math>|2}} </div> <div style="margin-left: calc(1.6em * 3);"> {{Numbered block||<math>-2x+y-2z=0</math>|3}} </div> </div> form a system of three equations.	The following equations $3x+2y-z=1$ 1 $2x-2y+4z=-2$ 2 $-2x+y-2z=0$ 3 form a system of three equations.
Unordered list
* <math>3x+2y-z=1</math> * <math>2x-2y+4z=-2</math> * <math>-2x+y-2z=0</math>	$3x+2y-z=1$ $2x-2y+4z=-2$ $-2x+y-2z=0$
* {{Numbered block||<math>3x+2y-z=1</math>|Eq. 1}} * {{Numbered block||<math>2x-2y+4z=-2</math>|Eq. 2}} * {{Numbered block||<math>-2x+y-2z=0</math>|Eq. 3}}	$3x+2y-z=1$ Eq. 1 $2x-2y+4z=-2$ Eq. 2 $-2x+y-2z=0$ Eq. 3
<ul style="line-height: 0;"> <li><div style="display: inline-block; width: 100%; vertical-align: middle;">{{Numbered block||<math>3x+2y-z=1</math>|Eq. 1}}</div></li> <li><div style="display: inline-block; width: 100%; vertical-align: middle;">{{Numbered block||<math>2x-2y+4z=-2</math>|Eq. 2}}</div></li> <li><div style="display: inline-block; width: 100%; vertical-align: middle;">{{Numbered block||<math>-2x+y-2z=0</math>|Eq. 3}}</div></li> </ul>	$3x+2y-z=1$ Eq. 1 $2x-2y+4z=-2$ Eq. 2 $-2x+y-2z=0$ Eq. 3
<ul style="line-height: 0;"> <li><div style="display: inline-table; width: 100%; vertical-align: middle;">{{Numbered block||<math>3x+2y-z=1</math>|Eq. 1}}</div></li> <li><div style="display: inline-table; width: 100%; vertical-align: middle;">{{Numbered block||<math>2x-2y+4z=-2</math>|Eq. 2}}</div></li> <li><div style="display: inline-table; width: 100%; vertical-align: middle;">{{Numbered block||<math>-2x+y-2z=0</math>|Eq. 3}}</div></li> </ul>	$3x+2y-z=1$ Eq. 1 $2x-2y+4z=-2$ Eq. 2 $-2x+y-2z=0$ Eq. 3
Ordered list
# <math>3x+2y-z=1</math> # <math>2x-2y+4z=-2</math> # <math>-2x+y-2z=0</math>	$3x+2y-z=1$ $2x-2y+4z=-2$ $-2x+y-2z=0$
# {{Numbered block||<math>3x+2y-z=1</math>|Eq. 1}} # {{Numbered block||<math>2x-2y+4z=-2</math>|Eq. 2}} # {{Numbered block||<math>-2x+y-2z=0</math>|Eq. 3}}	$3x+2y-z=1$ Eq. 1 $2x-2y+4z=-2$ Eq. 2 $-2x+y-2z=0$ Eq. 3
<ol style="line-height: 0;"> <li><div style="display: inline-block; width: 100%; vertical-align: middle;">{{Numbered block||<math>3x+2y-z=1</math>|Eq. 1}}</div></li> <li><div style="display: inline-block; width: 100%; vertical-align: middle;">{{Numbered block||<math>2x-2y+4z=-2</math>|Eq. 2}}</div></li> <li><div style="display: inline-block; width: 100%; vertical-align: middle;">{{Numbered block||<math>-2x+y-2z=0</math>|Eq. 3}}</div></li> </ol>	$3x+2y-z=1$ Eq. 1 $2x-2y+4z=-2$ Eq. 2 $-2x+y-2z=0$ Eq. 3
<ol style="line-height: 0;"> <li><div style="display: inline-table; width: 100%; vertical-align: middle;">{{Numbered block||<math>3x+2y-z=1</math>|Eq. 1}}</div></li> <li><div style="display: inline-table; width: 100%; vertical-align: middle;">{{Numbered block||<math>2x-2y+4z=-2</math>|Eq. 2}}</div></li> <li><div style="display: inline-table; width: 100%; vertical-align: middle;">{{Numbered block||<math>-2x+y-2z=0</math>|Eq. 3}}</div></li> </ol>	$3x+2y-z=1$ Eq. 1 $2x-2y+4z=-2$ Eq. 2 $-2x+y-2z=0$ Eq. 3
Border
{{Numbered block|:|<math>y=ax+b</math>|Eq. 3|Border=1}}	$y=ax+b$ Eq. 3

When content of the blocks and block numbers are far apart

Markup

<div style="line-height:0;"> {{Numbered block|1=:|2=<math>a^2 + b^2 = (a + b i) (a - b i)</math>|3=1}} {{Numbered block|1=:|2=<math>a^2 - b^2 = (a + b) (a - b)</math>|3=2}} {{Numbered block|1=:|2=<math>e^{i x} = \cos x + i \sin x</math>|3=3}} {{Numbered block|1=:|2=<math>\sin^2 \theta + \cos^2 \theta = 1</math>|3=4}} {{Numbered block|1=:|2=<math>\sin(2 \theta) = 2 \sin \theta \cos \theta</math>|3=5}} </div>

Renders as

$a^{2}+b^{2}=(a+bi)(a-bi)$ 1 $a^{2}-b^{2}=(a+b)(a-b)$ 2 $e^{ix}=\cos x+i\sin x$ 3 $\sin ^{2}\theta +\cos ^{2}\theta =1$ 4 $\sin(2\theta )=2\sin \theta \cos \theta$ 5

Markup

<div style="line-height:0;"> {{Numbered block|1=:|2=<math>a^2 + b^2 = (a + b i) (a - b i)</math>|3=1|LnSty=0.37ex dotted Gainsboro}} {{Numbered block|1=:|2=<math>a^2 - b^2 = (a + b) (a - b)</math>|3=2|LnSty=0.37ex dotted Gainsboro}} {{Numbered block|1=:|2=<math>e^{i x} = \cos x + i \sin x</math>|3=3|LnSty=0.37ex dotted Gainsboro}} {{Numbered block|1=:|2=<math>\sin^2 \theta + \cos^2 \theta = 1</math>|3=4|LnSty=0.37ex dotted Gainsboro}} {{Numbered block|1=:|2=<math>\sin(2 \theta) = 2 \sin \theta \cos \theta</math>|3=5|LnSty=0.37ex dotted Gainsboro}} </div>

Renders as

$a^{2}+b^{2}=(a+bi)(a-bi)$ 1 $a^{2}-b^{2}=(a+b)(a-b)$ 2 $e^{ix}=\cos x+i\sin x$ 3 $\sin ^{2}\theta +\cos ^{2}\theta =1$ 4 $\sin(2\theta )=2\sin \theta \cos \theta$ 5

Markup

<div style="line-height:0;"> {{Numbered block|1=:|2=<math>a^2 + b^2 = (a + b i) (a - b i)</math>|3=1|LnSty=0.37ex dotted Gainsboro}} {{Numbered block|1=:|2=<math>a^2 - b^2 = (a + b) (a - b)</math>|3=2|LnSty=0.37ex none Gainsboro}} {{Numbered block|1=:|2=<math>e^{i x} = \cos x + i \sin x</math>|3=3|LnSty=0.37ex dotted Gainsboro}} {{Numbered block|1=:|2=<math>\sin^2 \theta + \cos^2 \theta = 1</math>|3=4|LnSty=0.37ex none Gainsboro}} {{Numbered block|1=:|2=<math>\sin(2 \theta) = 2 \sin \theta \cos \theta</math>|3=5|LnSty=0.37ex dotted Gainsboro}} </div>

Renders as

$a^{2}+b^{2}=(a+bi)(a-bi)$ 1 $a^{2}-b^{2}=(a+b)(a-b)$ 2 $e^{ix}=\cos x+i\sin x$ 3 $\sin ^{2}\theta +\cos ^{2}\theta =1$ 4 $\sin(2\theta )=2\sin \theta \cos \theta$ 5

Markup

<div style="line-height:0;"> <div style="background-color: Beige;"> {{Numbered block|1=:|2=<math>a^2 + b^2 = (a + b i) (a - b i)</math>|3=1}} </div> <div style="background-color: none;"> {{Numbered block|1=:|2=<math>a^2 - b^2 = (a + b) (a - b)</math>|3=2}} </div> <div style="background-color: Beige;"> {{Numbered block|1=:|2=<math>e^{i x} = \cos x + i \sin x</math>|3=3}} </div> <div style="background-color: none;"> {{Numbered block|1=:|2=<math>\sin^2 \theta + \cos^2 \theta = 1</math>|3=4}} </div> <div style="background-color: Beige;"> {{Numbered block|1=:|2=<math>\sin(2 \theta) = 2 \sin \theta \cos \theta</math>|3=5}} </div> </div>

Renders as

$a^{2}+b^{2}=(a+bi)(a-bi)$ 1 $a^{2}-b^{2}=(a+b)(a-b)$ 2 $e^{ix}=\cos x+i\sin x$ 3 $\sin ^{2}\theta +\cos ^{2}\theta =1$ 4 $\sin(2\theta )=2\sin \theta \cos \theta$ 5

Markup

(mouse over the row you want to highlight) {{row hover highlight}} {| class="hover-highlight" style="line-height:0; width: 100%; border-collapse: collapse; margin: 0; padding: 0;" |- | {{Numbered block|1=:|2=<math>a^2 + b^2 = (a + b i) (a - b i)</math>|3=1}} |- | {{Numbered block|1=:|2=<math>a^2 - b^2 = (a + b) (a - b)</math>|3=2}} |- | {{Numbered block|1=:|2=<math>e^{i x} = \cos x + i \sin x</math>|3=3}} |- | {{Numbered block|1=:|2=<math>\sin^2 \theta + \cos^2 \theta = 1</math>|3=4}} |- | {{Numbered block|1=:|2=<math>\sin(2 \theta) = 2 \sin \theta \cos \theta</math>|3=5}} |}

Renders as

(mouse over the row you want to highlight) $a^{2}+b^{2}=(a+bi)(a-bi)$ 1 $a^{2}-b^{2}=(a+b)(a-b)$ 2 $e^{ix}=\cos x+i\sin x$ 3 $\sin ^{2}\theta +\cos ^{2}\theta =1$ 4 $\sin(2\theta )=2\sin \theta \cos \theta$ 5

Positioning relative to surrounding images

Numbered blocks should be able to be placed around images that take up space on the left or right side of the screen. To ensure numbered block has access to the entire line, consider using a {{clear}}-like template.

To illustrate, consider the example:

Markup

[[Image:Bnet_fan2.png|frame|right|Fig.1: Bayesian Network representation of Eq.(6)]] [[Image:Bnet_fan2.png|frame|left|Fig.1: Bayesian Network representation of Eq.(6)]] <br><br>A Bayesian network (or a belief network) is a probabilistic graphical model that represents a set of variables and their probabilistic independencies. For example, a Bayesian network could represent the probabilistic relationships between diseases and symptoms. Given symptoms, the network can be used to compute the probabilities of the presence of various diseases. {{Numbered block|1=:|2=<math> P(a, b, \lambda) = P(a| \lambda) P(b | \lambda) P(\lambda)\, </math>,|3='''Eq.(6)'''|RawN=.}}

Renders as

Fig.1: Bayesian Network representation of Eq.(6) Fig.1: Bayesian Network representation of Eq.(6) A Bayesian network (or a belief network) is a probabilistic graphical model that represents a set of variables and their probabilistic independencies. For example, a Bayesian network could represent the probabilistic relationships between diseases and symptoms. Given symptoms, the network can be used to compute the probabilities of the presence of various diseases. $P(a,b,\lambda )=P(a|\lambda )P(b|\lambda )P(\lambda )\,$, Eq.(6)

If it is desirable for the numbered block to span the entire line, a {{clear}} should be placed before it.

Markup

[[Image:Bnet_fan2.png|frame|right|Fig.1: Bayesian Network representation of Eq.(6)]] [[Image:Bnet_fan2.png|frame|left|Fig.1: Bayesian Network representation of Eq.(6)]] <br><br>A Bayesian network (or a belief network) is a probabilistic graphical model that represents a set of variables and their probabilistic independencies. For example, a Bayesian network could represent the probabilistic relationships between diseases and symptoms. Given symptoms, the network can be used to compute the probabilities of the presence of various diseases. {{clear}} {{Numbered block|1=:|2=<math> P(a, b, \lambda) = P(a| \lambda) P(b | \lambda) P(\lambda)\, </math>,|3='''Eq.(6)'''|RawN=.}}

Renders as

Fig.1: Bayesian Network representation of Eq.(6) Fig.1: Bayesian Network representation of Eq.(6) A Bayesian network (or a belief network) is a probabilistic graphical model that represents a set of variables and their probabilistic independencies. For example, a Bayesian network could represent the probabilistic relationships between diseases and symptoms. Given symptoms, the network can be used to compute the probabilities of the presence of various diseases. $P(a,b,\lambda )=P(a|\lambda )P(b|\lambda )P(\lambda )\,$, Eq.(6)

Table caveat

Because {{Numbered block}} is implemented as a table, putting {{Numbered block}} within a table yields a nested table. Due to a bug in MediaWiki's handling of nested tables, {{Numbered block}} must be used carefully in this case. In particular, when indentation for the outer table is desired, use explicit <dl><dd>...</dd></dl> tags for indentation instead of a leading colon (:).

For example,

Markup	<dl><dd> {| |<math>(f * g)[n]\,</math>&nbsp; &nbsp; &nbsp; |{{Numbered block||<math>\stackrel{\mathrm{def}}{=}\sum_{m=-\infty}^{\infty} f[m]\cdot g[n - m]\,</math>| 3=<span style="color:darkred">'''(Eq.1)'''</span>|RawN=.}} |- | |<math>= \sum_{m=-\infty}^{\infty} f[n-m]\cdot g[m].\,</math> &nbsp; &nbsp; &nbsp; ([[Convolution#Commutativity|commutativity]]) |} </dd></dl>
Renders as	$(f*g)[n]\,$      ${\stackrel {\mathrm {def} }{=}}\sum _{m=-\infty }^{\infty }f[m]\cdot g[n-m]\,$ (Eq.1) $=\sum _{m=-\infty }^{\infty }f[n-m]\cdot g[m].\,$       (commutativity)

which shows how the outer <dl><dd>...</dd></dl> tags give the same indentation as a single colon (:) preceding the table should.

For another example,

Markup	<dl><dd> <dl><dd> {| |- |The first parameter for indentation still works when used inside table. {{Numbered block|::::|<math>ax^2+bx+c=0</math>|Level 4}} {{Numbered block|:::|<math>ax^2+bx+c=0</math>|Level 3}} {{Numbered block|::|<math>ax^2+bx+c=0</math>|Level 2}} {{Numbered block|:|<math>ax^2+bx+c=0</math>|Level 1}} {{Numbered block||<math>ax^2+bx+c=0</math>|Level 0}} |- |} </dd></dl> </dd></dl>
Renders as	The first parameter for indentation still works when used inside table. $ax^{2}+bx+c=0$ Level 4 $ax^{2}+bx+c=0$ Level 3 $ax^{2}+bx+c=0$ Level 2 $ax^{2}+bx+c=0$ Level 1 $ax^{2}+bx+c=0$ Level 0

which uses two sets of explicit tags to give the same indentation as two colons (::).