The Imaginary Unit
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
The imaginary unit i is defined as the square root of −1, so that i² = −1; i is the principal, positive root.
Show
No real number squares to a negative, so i lives off the real line — a new number admitted under the old rules.
Watch for
i is a number, not a variable.
Builds on
- Nothing — this is a starting point.
Unlocks
- Nothing yet depends on this.