Very simple left align document class

Question

Is this document class an article? I can't get it left aligned. Haldane.pdf How can I achieve this simple style?

Answer 1

The document looks like it was produced with one of the KOMA-script document classes, possibly scrartcl.

You raise a separate question: How does one typeset a document with left-justified (AKA ragged-right) text? For that, I suggest that you (i) load the package ragged2e with the document option set, i.e., issue the command \usepackage[document]{ragged2e} and (ii) issue the command \RaggedRight. Both commands should be inserted in the preamble of your document.