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+single character inline equation. (valid=True)
+.
+\(a\)
+.
+<p><eq>a</eq></p>
+.
+
+inline equation with single greek character (valid=True)
+.
+\(\\varphi\)
+.
+<p><eq>\\varphi</eq></p>
+.
+
+simple equation starting and ending with numbers. (valid=True)
+.
+\(1+1=2\)
+.
+<p><eq>1+1=2</eq></p>
+.
+
+simple equation including special html character. (valid=True)
+.
+\(1+1<3\)
+.
+<p><eq>1+1<3</eq></p>
+.
+
+equation including backslashes. (valid=True)
+.
+\(a \\backslash\)
+.
+<p><eq>a \\backslash</eq></p>
+.
+
+use of currency symbol (valid=True)
+.
+You get 3$ if you solve \(1+2\)
+.
+<p>You get 3$ if you solve <eq>1+2</eq></p>
+.
+
+use of currency symbol (valid=True)
+.
+If you solve \(1+2\) you get $3
+.
+<p>If you solve <eq>1+2</eq> you get $3</p>
+.
+
+inline fraction (valid=True)
+.
+\(\\frac{1}{2}\)
+.
+<p><eq>\\frac{1}{2}</eq></p>
+.
+
+inline column vector (valid=True)
+.
+\(\\begin{pmatrix}x\\\\y\\end{pmatrix}\)
+.
+<p><eq>\\begin{pmatrix}x\\\\y\\end{pmatrix}</eq></p>
+.
+
+inline bold vector notation (valid=True)
+.
+\({\\tilde\\bold e}_\\alpha\)
+.
+<p><eq>{\\tilde\\bold e}_\\alpha</eq></p>
+.
+
+exponentiation (valid=True)
+.
+\(a^{b}\)
+.
+<p><eq>a^{b}</eq></p>
+.
+
+conjugate complex (valid=True)
+.
+\(a^\*b\) with \(a^\*\)
+.
+<p><eq>a^\*b</eq> with <eq>a^\*</eq></p>
+.
+
+Inline multi-line (valid=True)
+.
+a \(a
+\not=1\) b
+.
+<p>a <eq>a
+\not=1</eq> b</p>
+.
+
+Inline multi-line with newline (valid=False)
+.
+a \(a
+
+\not=1\) b
+.
+<p>a (a</p>
+<p>\not=1) b</p>
+.
+
+single block equation, greek index (valid=True)
+.
+\[e_\\alpha\]
+.
+<section>
+<eqn>e_\\alpha</eqn>
+</section>
+.
+
+display equation on its own single line. (valid=True)
+.
+\[1+1=2\]
+.
+<section>
+<eqn>1+1=2</eqn>
+</section>
+.
+
+inline equation followed by block equation. (valid=True)
+.
+\({e}_x\)
+
+\[e_\\alpha\]
+.
+<p><eq>{e}_x</eq></p>
+<section>
+<eqn>e_\\alpha</eqn>
+</section>
+.
+
+underline tests (valid=True)
+.
+\[c{\\bold e}_x = a{\\bold e}_\\alpha - b\\tilde{\\bold e}_\\alpha\]
+.
+<section>
+<eqn>c{\\bold e}_x = a{\\bold e}_\\alpha - b\\tilde{\\bold e}_\\alpha</eqn>
+</section>
+.
+
+non-numeric character before opening $ or
+after closing $ or both is allowed. (valid=True)
+.
+a\(1+1=2\)
+\(1+1=2\)b
+c\(x\)d
+.
+<p>a<eq>1+1=2</eq>
+<eq>1+1=2</eq>b
+c<eq>x</eq>d</p>
+.
+
+following dollar character '$' is allowed. (valid=True)
+.
+\(x\) $
+.
+<p><eq>x</eq> $</p>
+.
+
+consecutive inline equations. (valid=True)
+.
+\(x\) \(y\)
+.
+<p><eq>x</eq> <eq>y</eq></p>
+.
+
+inline equation after '-' sign in text. (valid=True)
+.
+so-what is \(x\)
+.
+<p>so-what is <eq>x</eq></p>
+.
+
+display equation with line breaks. (valid=True)
+.
+\[
+1+1=2
+\]
+.
+<section>
+<eqn>
+1+1=2
+</eqn>
+</section>
+.
+
+multiple equations (valid=True)
+.
+\[
+a = 1
+\]
+
+\[
+b = 2
+\]
+.
+<section>
+<eqn>
+a = 1
+</eqn>
+</section>
+<section>
+<eqn>
+b = 2
+</eqn>
+</section>
+.
+
+equation followed by a labelled equation (valid=True)
+.
+\[
+a = 1
+\]
+
+\[
+b = 2
+\] (1)
+.
+<section>
+<eqn>
+a = 1
+</eqn>
+</section>
+<section>
+<eqn>
+b = 2
+</eqn>
+</section>
+.
+
+multiline equation. (valid=True)
+.
+\[\\begin{matrix}
+ f & = & 2 + x + 3 \\ 
+ & = & 5 + x 
+\\end{matrix}\]
+.
+<section>
+<eqn>\\begin{matrix}
+ f & = & 2 + x + 3 \\ 
+ & = & 5 + x 
+\\end{matrix}</eqn>
+</section>
+.
+
+vector equation. (valid=True)
+.
+\[\\begin{pmatrix}x_2 \\\\ y_2 \\end{pmatrix} = 
+\\begin{pmatrix} A & B \\\\ C & D \\end{pmatrix}\\cdot
+\\begin{pmatrix} x_1 \\\\ y_1 \\end{pmatrix}\]
+.
+<section>
+<eqn>\\begin{pmatrix}x_2 \\\\ y_2 \\end{pmatrix} = 
+\\begin{pmatrix} A & B \\\\ C & D \\end{pmatrix}\\cdot
+\\begin{pmatrix} x_1 \\\\ y_1 \\end{pmatrix}</eqn>
+</section>
+.
+
+display equation with equation number. (valid=True)
+.
+\[f(x) = x^2 - 1\] (1)
+.
+<section>
+<eqn>f(x) = x^2 - 1</eqn>
+</section>
+.
+
+inline equation following code section. (valid=True)
+.
+`code`\(a-b\)
+.
+<p><code>code</code><eq>a-b</eq></p>
+.
+
+equation following code block. (valid=True)
+.
+```
+code
+```
+\[a+b\]
+.
+<pre><code>code
+</code></pre>
+<section>
+<eqn>a+b</eqn>
+</section>
+.
+
+numbered equation following code block. (valid=True)
+.
+```
+code
+```
+\[a+b\](1)
+.
+<pre><code>code
+</code></pre>
+<section>
+<eqn>a+b</eqn>
+</section>
+.
+
+Equations in list. (valid=True)
+.
+1. \(1+2\)
+2. \(2+3\)
+    1. \(3+4\)
+.
+<ol>
+<li><eq>1+2</eq></li>
+<li><eq>2+3</eq>
+<ol>
+<li><eq>3+4</eq></li>
+</ol>
+</li>
+</ol>
+.
+
+Inline sum. (valid=True)
+.
+\(\\sum\_{i=1}^n\)
+.
+<p><eq>\\sum\_{i=1}^n</eq></p>
+.
+
+Sum without equation number. (valid=True)
+.
+\[\\sum\_{i=1}^n\]
+.
+<section>
+<eqn>\\sum\_{i=1}^n</eqn>
+</section>
+.
+
+Sum with equation number. (valid=True)
+.
+\[\\sum\_{i=1}\^n\] \(2\)
+.
+<section>
+<eqn>\\sum\_{i=1}\^n</eqn>
+</section>
+.
+
+equation number always vertically aligned. (valid=True)
+.
+\[{\\bold e}(\\varphi) = \\begin{pmatrix}
+\\cos\\varphi\\\\\\sin\\varphi
+\\end{pmatrix}\] (3)
+.
+<section>
+<eqn>{\\bold e}(\\varphi) = \\begin{pmatrix}
+\\cos\\varphi\\\\\\sin\\varphi
+\\end{pmatrix}</eqn>
+</section>
+.
+
+inline equations in blockquote. (valid=True)
+.
+> see \(a = b + c\) 
+> \(c^2=a^2+b^2\) (2) 
+> \(c^2=a^2+b^2\) 
+.
+<blockquote>
+<p>see <eq>a = b + c</eq>
+<eq>c^2=a^2+b^2</eq> (2)
+<eq>c^2=a^2+b^2</eq></p>
+</blockquote>
+.
+
+display equation in blockquote. (valid=True)
+.
+> formula
+>
+> \[ a+b=c\] (2)
+>
+> in blockquote. 
+.
+<blockquote>
+<p>formula</p>
+<section>
+<eqn> a+b=c</eqn>
+</section>
+<p>in blockquote.</p>
+</blockquote>
+.