1. Imagine a normal calculator except that it displays A for 0, B for 1, up to J for 9. So the number 372 would appear as DHC. Does this affect the formal transparency of the calculator? Should it? 2....

1. Imagine a normal calculator except that it displays A for 0, B for 1, up to J for 9. So the number 372 would appear as DHC. Does this affect the formal transparency of the calculator? Should it?

2. To some extent undo is similar to the ‘back’ command or button found in many web browsers, help systems and hypertext systems. Is the ‘back’ button on a browser just like undo?