I am in the situation where I need to define some parameters similar to each other.
For this reason I would like to define them in an eqnarray or align.
Unfortunately, one of the right hand part of the definitions are overly long for a single line.

Is it possible to use a multline or similar inside an eqnarray or align?

  • 2
    A general recommendation: Never use eqnarray. The multi-line display math environments -- such as align -- provided by the amsmath package are far super to eqnarray.
    – Mico
    Aug 19 '19 at 13:36
  • 3
    If you load mathtools, you can use multlined (within an align since it's an extension of amsmath).
    – Bernard
    Aug 19 '19 at 13:39

You asked,

Is it possible to use a multline or similar inside an ... align?

You can't use a multline environment inside an align environment. However, it's alright to use aligned and multlined environments -- the latter requires loading the mathtools package -- inside align environments.

A minimum working example (MWE):

enter image description here

\usepackage{mathtools} % loads "amsmath" automatically
a &= b+c \notag \\
  &= \begin{multlined}[t]
     d+e+f+g \\
     \end{multlined} \notag \\
  &= s+t+u

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