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Please Is there a clear answer to these questions

  • Thread starter m_s_a
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  • #1
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suppose z=2+3i , w=1-5i
1)make Compare between z,w

2)find z!

3)IzI=sqart root (z^2)
or IzI=sqart root(zz')
IzI=sqart root (z^2)=sqart root(zz')

4) Compare between 1,i

5) i!=????

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Redbelly98
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Where is your attempt at a solution?
 
  • #3
Defennder
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suppose z=2+3i , w=1-5i
1)make Compare between z,w
What does this mean?
 
  • #4
HallsofIvy
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1. What do you mean by "compare"? Find the difference? Absolute value of difference?

2. Is "!" supposed to be the factorial? It's only defined for positive integers, not complex numbers.

3. If, by ', you mean "complex conjugate", then [itex]|z|= \sqrt{zz'}[/itex] which is NOT the same as [itex]\sqrt{z^2}[/itex] unless z is real.
 
  • #5
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1. What do you mean by "compare"? Find the difference? Absolute value of difference?


I mean
Z<W OR W<Z

Thank you for assistance
 
  • #6
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PLEASE:
What is the meaning of the fifth question?
 

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  • #7
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Please answer
 
  • #8
Redbelly98
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The question being asked is:

5. Suppose f(z) = 3xy + i(x-y^2). Find lim{z -> 3+2i} of f(z), or explain carefully why it does not exist.

I am guessing that z=x+iy. I.e. z=3+2i means x=3 and y=2. However, this makes the question rather easy, just plugging in x=3 and y=2 into the given expression. If they mean something else I don't know what that is.
 
  • #9
Redbelly98
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I mean
Z<W OR W<Z
I am unaware of any definition of "less than" or "greater than" concerning complex numbers.
 
  • #10
HallsofIvy
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1. What do you mean by "compare"? Find the difference? Absolute value of difference?

I mean
Z<W OR W<Z

Thank you for assistance
Neither. The field of complex numbers is NOT an "ordered field".
 
  • #11
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Defennder
HallsofIvy
Redbelly98
HallsofIvy

Thank you very much
Thank's alot
 

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