This is a test file with some referenced equations, line $$ this $$
Some equations might be inside of text, $$ for example $$ this one.
Some equations might be on start of paragraphs:
$$ start $$ of paragraph.
Other might be on separate paragraphs of their own:
$$ separate $$
Some of those can be labelled:
This is a test file with some referenced equations, line
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$$ this $$ $$(1)$
$
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Some equations might be inside of text,
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$$ for example $$ $$(2)$
$
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this one.
Some equations might be on start of paragraphs:
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$$ start $$ $$(3)$
$
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of paragraph.
Other might be on separate paragraphs of their own:
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$$ separate $$ $$(4)$
$
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Then they can be referenced:
Individually eq. 1, eq. 2, eq. 3, eq. 4
Or in groups eqns. 1, 2, 4
Groups will be compacted eqns. 1-4