# Template:EquationRef

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The pair of templates {{EquationRef}} and {{EquationNote}} is used for labeling equations in text.

For example, :{{EquationRef|Eq. 1}} $x^2+x+1=0\$ results in:

Eq. 1 ${\displaystyle x^{2}+x+1=0\ }$

Here, the identifier "Eq. 1" is a label which can be later referred to with a call to {{EquationNote}}. That is, {{EquationNote|Eq. 1}} produces a link Eq. 1 to this equation.

Similarly, :{{EquationRef|2|Eq. 2:}} $x^2-2x+1=0\$ results in

Eq. 2: ${\displaystyle x^{2}-2x+1=0\ }$

which can be referred to by {{EquationNote|2}} or even {{EquationNote|2|Equation 2}} (i.e., Equation 2).

This template can be used together with {{NumBlk}} to produce nicely formatted numbered equations. For instance:

• {{NumBlk|::|$x^2+x+1=0\$|{{EquationRef|3}}}} gives

 ${\displaystyle x^{2}+x+1=0\ }$ (3)
which may then be referred to by {{EquationNote|3}} or even {{EquationNote|3|Eq. 3}} (i.e., Eq. 3).
• {{NumBlk|::|$x^2+x+1=0\$|{{EquationRef|4|Eq.4}}}} gives

 ${\displaystyle x^{2}+x+1=0\ }$ (Eq.4)
which may be referred to by {{EquationNote|4}} (i.e., 4).
• {{NumBlk|::|$x^2+x+1=0\$|{{EquationRef|Eq.5}}}} gives

 ${\displaystyle x^{2}+x+1=0\ }$ (Eq.5)
which may be referred to by {{EquationNote|Eq.5}} (i.e., Eq.5).