**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