I need to write a text just in this format
\documentclass[twocolumn]{article}.
But I need to switch between single column and double column several times in the same page, without jumping to a new page every time I switch the format. Is this possible without using any package like \usepackage{multicol}
?
multicol.st
it has the same status asarticle.cls
a file in the core latex distribution, you have to input some macro files or you can not typeset anything in latex.