Engineering drawing drawing on A3 may be enlarged to A2 or reduced to A4. The U.S. customary "A-size" corresponds to "letter" size, and "B-size" corresponds to "ledger" or "tabloid" size. There were also once British paper sizes, which went by names rather than alphanumeric designations. American Society of Mechanical Engineers (ASME) ANSI/ASME Y14.1, Y14.2, Y14.3, and Y14.5 are commonly referenced standards in the U.S. Technical lettering is the process of forming letters, numerals, and other characters in technical drawing. It is used to describe, or provide detailed specifications for an object. With the goals of legibility and uniformity, styles are standardized and
Seventh Letter year later. Of all the letters attributed to Plato, the "Seventh Letter" is widely considered the only one that might be authentic. R. Ledger defends its authenticity on the basis of computer analysis. Anthony Kenny is likewise inclined to accept it as genuine. The main objections to its authenticity involve its statement that there are forms or ideas of artificial things, whereas Aristotle attributes to Plato the idea that there are forms or ideas only of natural things, as well as the fact that the letter's purported historical setting seems unlikely: the letter implies that Dion's followers wrote to Plato