Ping Pong Math node - what does it do?

Hello everyone! People please tell me! How can i implement the same result that this node pingpong math does?
In other words. Is it possible to build this node using other math nodes?
thank!

It’s a triangle wave.

The answer here has setups for different waves with blender nodes, triangle wave included.

Thank you so much! And I could not find it on the Internet) I’ll see it now!

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