Understanding the Inequality of Complex Numbers: |z+w|=|z-w|?

Click For Summary
SUMMARY

The discussion centers on the inequality involving complex numbers, specifically ||z|-|w|| ≤ |z+w| ≤ |z|+|w|. The participants clarify that substituting w with -w in the inequality maintains its validity, confirming that |z+w| is not equal to |z-w|. This conclusion is established through the properties of absolute values in complex number operations, emphasizing the importance of understanding these inequalities in complex analysis.

PREREQUISITES
  • Understanding of complex numbers and their properties
  • Familiarity with absolute value concepts in mathematics
  • Knowledge of inequalities and their applications
  • Basic skills in mathematical proofs and substitutions
NEXT STEPS
  • Study the properties of absolute values in complex analysis
  • Explore the triangle inequality in greater depth
  • Learn about complex number operations and their geometric interpretations
  • Investigate advanced topics in inequalities involving complex numbers
USEFUL FOR

Mathematicians, students studying complex analysis, and anyone interested in the properties and inequalities of complex numbers.

mynameisfunk
Messages
122
Reaction score
0
OK, in my book we have an inequality ||z|-|w||[tex]\leq[/tex]|z+w|[tex]\leq[/tex]|z|+|w| then from here it simply states, "Replacing w by -w here shows that ||z|-|w||[tex]\leq[/tex]|z-w|[tex]\leq[/tex]|z|+|w|.

How do we know that?
is |z+w|=|z-w|?? Note that z and w are complex numbers.
 
Physics news on Phys.org
No, |z+w| is NOT equal to |z-w|. Your first inequality is true for all w. Therefore it also must be true for -w. Substitute '-w' everywhere you see 'w' in the first inequality.
 
Dick said:
No, |z+w| is NOT equal to |z-w|. Your first inequality is true for all w. Therefore it also must be true for -w. Substitute '-w' everywhere you see 'w' in the first inequality.

Thanks a lot Dick, again. You rock
 

Similar threads

Replies
12
Views
2K
  • · Replies 13 ·
Replies
13
Views
2K
Replies
11
Views
3K
  • · Replies 9 ·
Replies
9
Views
3K
Replies
7
Views
2K
Replies
8
Views
2K
Replies
1
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 10 ·
Replies
10
Views
2K
Replies
2
Views
2K