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Cross References
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One reason for numbering things like figures and equations
is to refer the reader to them, as in "See Figure 3 for more
details."

\label: Assign a symbolic name to a piece of text.
\pageref: Refer to a page number.
\ref: Refer to a section, figure or similar.

############################################################
       \label ::label::
############################################################
\label{key}
A \label command appearing in ordinary text assigns to the
key the number of the current sectional unit; one appearing
inside a numbered environment assigns that number to the key.

A key can consist of any sequence of letters, digits, or
punctuation characters.

Upper and lowercase letters are different.

To avoid accidentally creating two labels with the same name,
it is common to use labels consisting of a prefix and a suffix
separated by a colon. The prefixes conventionally used are
       cha for chapters
       sec for lower-level sectioning commands
       fig for figures
       tab for tables
       eq for equations
Thus, a label for a figure would look like fig:bandersnatch.
############################################################
       \pageref ::pageref::
############################################################
\pageref{key}
The \pageref command produces the page number of the place
in the text where the corresponding \label command appears.
ie. where \label{key} appears.
############################################################
       \ref ::ref::
############################################################
\ref{key}
The \ref command produces the number of the sectional unit,
equation number, ... of the corresponding \label command.
@

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