I've spent a portion of my career working in the newspaper business, at the time when movable type (letters and symbols on separate tiny blocks of metal, arranged by a typesetter) was being replaced by photographic film. In those distant 'movable type' days, creating mathematical notation was considered so special (and difficult) that typesetters used to charge extra to compose it. When we became computerized, arranging mathematical notation should have been easy, assuming the software used to compose the pages supported math notation. Unfortunately, the software often didn't! To solve the problem, Donald Knuth developed his own typesetting system called TeX, which was a formatting language not just for mathematics but for entire documents. It was Leslie Lamport who created LaTeX (again, pronounced lah-tek), a more advanced version of TeX, built on the same technology.
In order to produce mathematical notation, we can write an equation...