Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Evaluating complex numbers

  1. Sep 12, 2004 #1
    How do you evaluate this expression algebraically.

  2. jcsd
  3. Sep 12, 2004 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Since i=exp(i*pi/2), you can determine easily sqrt(i) in polar form, then in rectangular form: a+bi. Then you can evaluate exp(a+bi).
  4. Sep 12, 2004 #3


    User Avatar
    Science Advisor
    Homework Helper

    If you take [itex]i = e^{i \frac {pi}{2}}[/itex] then [itex]\sqrt i = e^{i \frac {pi}{4}}[/itex]. Just write it in trig form and put into your expression.
  5. Sep 12, 2004 #4
    easy peasy. thanks
  6. Sep 12, 2004 #5
    Not quite. Don't forget the second root exp[i(pi/4 + pi)].
  7. Sep 13, 2004 #6
    Ahh yes, those pesky multiple values. That complex plane will eventually bend to my will.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook