PlanetPhysics/C 3CategoryCorollary

\newcommand{\sqdiagram}[9]{Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "http://localhost:6011/en.wikiversity.org/v1/":): {\displaystyle \diagram #1 \rto^{#2} \dto_{#4}& \eqno{\mbox{#9}}} }

\begin{corollary} (Corollary 1.3 in ref. .)

Any complete $C_{3}$-category ${\mathcal {A}}$ is a $C_{2}$-category.

\end{corollary}