Advice: sqrt(-1) is I

In Maple input, I is used for . This is an alias, rather than an assigned value. You can remove the alias if you wish:

> alias(I=I);

> solve(x^2=-1);

And if you prefer, you can use i or j instead.

> alias(j=sqrt(-1));

> solve(x^2=-1);

This practice is slightly dangerous, as you may run into some Maple code that uses I for sqrt(-1) (probably not in Maple itself, but it could happen in something written by others).

See also: I , alias

Maple Advisor Database R. Israel, 1997