Prove this inequality involving metrics

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SUMMARY

The discussion centers on proving the inequality involving metrics, specifically that for any metric space (X, ρ), the relationship |ρ(x, z) - ρ(y, u)| ≤ ρ(x, y) + ρ(z, u) holds true. Participants emphasize the necessity of applying the triangle inequality iteratively to establish this proof. Additionally, visual aids such as sketches are suggested to better understand the distances involved in the proof process.

PREREQUISITES
  • Understanding of metric spaces and their properties
  • Familiarity with the triangle inequality in mathematics
  • Basic knowledge of distance functions and their applications
  • Ability to visualize geometric relationships in metric spaces
NEXT STEPS
  • Study the properties of metric spaces in detail
  • Explore advanced applications of the triangle inequality in various mathematical contexts
  • Learn about visualizing metrics through geometric sketches
  • Investigate other inequalities related to metrics, such as the Minkowski inequality
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Mathematicians, students studying metric spaces, and anyone interested in understanding the foundational principles of distance metrics and their applications in proofs.

TMO
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For any metric ##(X, \rho)## and points therein, prove that ##|\rho(x, z) - \rho(y, u)| \leq \rho(x, y) + \rho(z, u)##.

I know that this will involve iterated applications of the triangle inequality...but I still need another hint on how to proceed.
 
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Did you draw a sketch? Consider distances to z-x+y, for example.
 

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