Z:gnu-www-ja-stallman-mec-india--b4fd08-So, why is this? The reason is/en

So, why is this? The reason is that, in other fields, people have to deal with the perversity of matter. You are designing circuits or cars or chemicals, you have to face the fact that these physical substances will do what they do, not what they are supposed to do. We in software don't have that problem, and that makes it tremendously easier. We are designing a collection of idealized mathematical parts which have definitions. They do exactly what they are defined to do.