Latex Eqnarray

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It is very much like a three-column
array environment , with position argument rcl ,
i.e., the columns are justified right, center, and left, respectively.
(However, \multicolumn may not be used.)


Consecutive rows are separated by \\
commands and consecutive items within a
row separated by an & . Any item may be empty, i.e., no text.


A separate equation number is placed on every
line unless that line has a \nonumber command.
The optional eqnarray* form does not generate any equation numbers.


A \label command anywhere within a
row generates a reference to that row's number.



\begin{eqnarray}
first formula left & first formula middle & first formula right \\
...
\end{eqnarray}


\begin{eqnarray*}
first formula left & first formula middle & first formula right \\
...
\end{eqnarray*}


\begin{eqnarray*}
\lefteqn{x_1+x_2+\cdots+x_n} \\
&\leq &y_1+y_2+\cdots+y_n \\
&= &z+y_3+\cdots+y_n
\end{eqnarray*}

The eqnarray environment is obsolete. It has infelicities,
including spacing that is inconsistent with other mathematics elements.
(See “Avoid eqnarray!” by Lars Madsen
https://tug.org/TUGboat/tb33-1/tb103madsen.pdf ). New documents
should include the amsmath package and use the displayed
mathematics environments provided there, such as the align
environment. We include a description only for completeness and for
working with old documents.

Display a sequence of equations or inequalities. The left and right
sides are typeset in display mode, while the middle is typeset in text
mode.

It is similar to a three-column array environment, with items
within a row separated by an ampersand ( & ), and with rows
separated by double backslash \\ ).

The starred form of line break ( \\* ) can also be used to separate
equations, and will disallow a page break there (see \\ ).

The unstarred form eqnarray places an equation number on every
line (using the equation counter), unless that line contains a
\nonumber command. The starred form eqnarray* omits
equation numbering, while otherwise being the same.

The command \lefteqn is used for splitting long formulas across
lines. It typesets its argument in display style flush left in a box of
zero width.

This example shows three lines. The first two lines make an inequality,
while the third line has not entry on the left side.


http://www.ctex.org/documents/latex/latex2e-html/ltx-223.html
https://latexref.xyz/eqnarray.html
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Help On LaTeX eqnarray
eqnarray (LaTeX2e unofficial reference manual (December 2020))
Using the eqnarray package - Andrew Roberts
eqnarray vs. align | TeXblog
Why not use eqnarray? | The TeX FAQ
equations - \eqnarray and \boxed - TeX - LaTeX Stack Exchange
Avoid eqnarray! - TeX
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Latex Eqnarray