Mathematical equations arc difficult to work with and understand. But at least they won’t be a pain to get into print if you use Expressionist, a new equation processor that creates and edits professional-quality equations in no time.
No matter which word processor you use regularly, you can add to it the ability to include equations with the Expressionist desk accessory. Point and click your way through even the most difficult matrices, summations, multi-dimensional tensors and limits. Then cut the equation and paste it into your document as you would any picture. Paste equations hack into Expressionist any time to edit them, Expressionist equations will enhance more than just word processing documents—they’ll go an where pictures will, into outlines, data base reports, spreadsheets and the like. (Excel Equations are automatically aligned and formatted properly as you enter them. Click on the integral icon and you’ll see a perfectly formed integral sign and boxes for entering the upper and lower limits and the integrand. Integral signs arc adjusted to the right size for the expression that follows, and the integration limits are offset, with the upper limit being slightly further to the right than the lower limit, as in textbooks. With fractions, the division bar can either be a straight horizontal line or the more comfortable slash. Almost any size matrix can be accommodated, and the matrix cells can be pasted in from a spreadsheet. If you need to create an expression that doesn’t follow normal typographic rules. Expressionist lets you freely move characters and symbols anywhere and control alignment of objects with respect to other objects. Almost any numerical expression in a typeset book can be duplicated exactly with little effort. Although Expressionist is specifically tuned to work best with the LaserWriter and the Times, Helvetica and Symbol fonts, it can also use any bit-map or PostScript font and can print to the Image Writer.
Expressionist is both a desk accessory and an application. Both are packaged together on the same disk, but they’re independent. Most of the time, you only need the desk accessory. Move the DA into your working system with Font/DA Mover and use it to paste any equations you create directly into your documents. The application works identically to the DA, but supports printing equations alone when another program isn’t handy.
The author, Alan Bonadio, has a background in both physics and computer science. He went to great pains to study equation typesetting systems on mainframe computers and in personal computer word processors and looked through hundreds of textbooks in the physical and engineering sciences to be sure he hadn’t left out any needed functions. He distilled what he learned into a reference manual that is 100 pages long and includes everything you’d ever want to know in an easy-to-use alphabetical format. Expressionist is one of the most well-documented Macintosh DAs.
Expressionist is a quintessential Macintosh application from the ground up. It's easy to learn and to use, makes excellent use of the mouse and keyboard for selecting and entering items, and never requires you to translate your equation into English words or encoded symbols as many word processors do. Simply click on the desired formula types and type in the text. The screen always displays the expression the way it will look when printed. The more you use it, the more impressed with it you’ll be. It’s exactly the equation processor you’d write for yourself.
Custor, Linda. (July 1987). Expressionist. MacUser. (pg. 64).
Allan Bonadio
Applications
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2020-09-15 / 
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Expressionist.sit
Emulating this? It could probably run under: 
Mini vMac
