On the following example, long equation shows up on the top of the second page.

The equation example is taken from <https://tex.stackexchange.com/a/321805/127048>.

```tex
\documentclass[5p,times]{elsarticle}
\usepackage{lipsum}
\usepackage{amsmath}
\begin{document}
\section{Start}
Hello World
\twocolumn[
{
    \begin{equation}\begin{split}
f_{r:n}(x)&=\frac{n!}{(r-1)!\,(n-r+1)!}
   \Biggl[ \biggl( \frac{x-1}{k}  \biggr)^{\!r-1}
           \biggl( \frac{k-x+1}{k}\biggr)^{\!n-r+1} \\
  &\qquad -\biggl( \frac{x}{k}    \biggr)^{\!r-1}
           \biggl( \frac{k-x}{k}  \biggr)^{\!n-r+1} \,
   \Biggr]+ f_{r-1:n}(x)
\end{split}\end{equation}
       }\bigskip]
\end{document}

```

output:

[![enter image description here](https://i.stack.imgur.com/NIBTv.png)](https://i.stack.imgur.com/NIBTv.png)

Is it possible to force the long equation to show up at the bottom of the first page or right after the `Hello World` text? Please note that I want to show the long equation in both of the two columns rather than fitting it into single column of the double-column.