Complex function ?

  • Thread starter PeetPb
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  • #1
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Main Question or Discussion Point

hi,
I'd like to ask whether the function f:y=|ln(x)| (|| denotes the absolute value) is complex. I'm a little bit confused because it is defined also for negative numbers in reals. Is the "negative part" classified as a complex function even if it has no imaginary part ?

thanx
 

Answers and Replies

  • #2
mathman
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Real numbers may be positive or negative. Real numbers are a subset of complex numbers where the imaginary part is 0, whether the real part is positive or negative.
 
  • #3
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Thanks, my question is , can I include that part of the plot where the independent variable is negative in real analysis ?
 
  • #4
mathman
Science Advisor
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If x is < 0, ln(x) is imaginary, but |ln(x)| is non-negative real. There is no rule that says you can't plot it.
 

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