Metafont, not strictly part of TeX, is a font description system which allows the designer to describe characters algorithmically. It uses Bézier curves in a fairly standard way to generate the actual characters to be displayed, but Knuth devotes substantial attention to the rasterizing problem on bitmapped displays. Another thesis, by John Hobby , further explores this problem of digitizing "brush trajectories". This term derives from the fact that Metafont describes characters as having been drawn by abstract brushes (and erasers). It is commonly believed that TeX is based on bitmap fonts but, in fact, these programs "know" nothing about the fonts that they are using other than their dimensions. It is the responsibility of the device driver to appropriately handle fonts of other types, including PostScript Type 1 and TrueType. Computer Modern (commonly known as "the TeX font") is freely available in Type 1 format, as are the AMS math fonts. Users of TeX systems that output directly to PDF, such as pdfTeX, XeTeX, or LuaTeX, generally never use Metafont output at all.
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VSA Inc formally known as Vogal – Swygard was founded in 1935. Richard Cole started out as a salesman in 1974 and became part owner / President of the Dallas location in 1981. VSA corporate headquarters and parts warehouse are located in Dallas, Texas at 10550 Shady Trail 75220. Dallas Pittman became part owner / Vice President of the Houston location in 1989. VSA Inc is a Factory Representative of petroleum, automotive, industrial and oil field supply parts and equipment. VSA Inc has been serving the Southwest territory for 76 years.