\begingroup

\lcTex{%
  \newlength{\EnvelopeRefWidthExtra}\setlength{\EnvelopeRefWidthExtra}{1.1cm}
  \newlength{\EnvelopeRefWidthLineReal}\setlength{\EnvelopeRefWidthLineReal}{\linewidth}
  \addtolength{\EnvelopeRefWidthLineReal}{-\EnvelopeRefWidthExtra}
  \newlength{\EnvelopeRefMinipageSpace}\setlength{\EnvelopeRefMinipageSpace}{0.2cm}

  \newlength{\EnvelopeRefWidthLeft}
  \newlength{\EnvelopeRefWidthRight}
}

\newcommand{\reals}{\mathbb{R}}

\input{Envelope_3_ref/intro}
\input{Envelope_3_ref/lower_envelope_3}
\input{Envelope_3_ref/upper_envelope_3}
\input{Envelope_3_ref/EnvelopeTraits_3}
\input{Envelope_3_ref/Env_triangle_traits}
\input{Envelope_3_ref/Env_sphere_traits}
\input{Envelope_3_ref/Env_surface_data_traits}
\input{Envelope_3_ref/Envelope_diagram}

\endgroup