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<center> <h1>A test of Equation References</h1> </center>

<div style=“padding:0 2em”> <hr> Here is a labeled equation: $$x+1oversqrt{1-x^2}label{ref1}$$ with a reference to ref1: ref{ref1}, and another numbered one with no label: $$x+1oversqrt{1-x^2}$$ This one uses nonumber: $$x+1oversqrt{1-x^2}nonumber$$ <p> <HR> <p> Here's one using the equation environment: begin{equation} x+1oversqrt{1-x^2} end{equation} and one with equation* environment: begin{equation*} x+1oversqrt{1-x^2} end{equation*} <p> <HR> <p> This is a forward reference [ref{ref2}] and another eqref{ref2} for the following equation: $$x+1oversqrt{1-x^2}label{ref2}$$ More math: $$x+1oversqrt{1-x^2}$$ Here is a ref inside math: (ref{ref2}+1) and text after it.

begin{align} x& = y_1-y_2+y_3-y_5+y_8-dots && text{by eqref{ref1}}\ & = y'circ y^* && text{(by eqref{ref3})}\ & = y(0) y' && text {by Axiom 1.} end{align}

Here's a bad ref [ref{ref4}] to a nonexistent label. <p> <HR> <p> An alignment: begin{align} a&=blabel{ref3}cr &=c+d end{align} and a starred one: begin{align*} a&=bcr &=c+d end{align*}

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