What is the name of this inequality?

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The inequality discussed is known as the triangle inequality, specifically represented as |(x-z)+(z-y)| ≤ |x-z| + |z-y|. This formulation is a generalization of the triangle inequality, which is commonly stated as |x+y| ≤ |x| + |y|. The term "triangle inequality 2" is used by the professor to refer to this broader case. The discussion confirms the validity of the triangle inequality as the correct terminology for the inequality in question.

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My prof. calls it the triangle inequality. However the wikipedia page with the same this name shows a special case of it, which is ##|x+y|\leq|x|+|y|##, and my prof. calls it the triangle inequality 2. I wonder what the formal name of the inequality in the picture above is. Thanks in adv.
 
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|(x-z)+(z-y)| \le |x-z|+|z-y|
 
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Leo Liu said:
Homework Statement:: .
Relevant Equations:: .

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My prof. calls it the triangle inequality. However the wikipedia page with the same this name shows a special case of it, which is ##|x+y|\leq|x|+|y|##, and my prof. calls it the triangle inequality 2. I wonder what the formal name of the inequality in the picture above is. Thanks in adv.
Triangle inequality is correct. The reason why is in post #2 by @anuttarasammyak .
 
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