What is the meaning of ph(z) in complex numbers?

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Exactly as stated in the title. What does ph(z) mean?
 
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Fellowroot said:
Exactly as stated in the title. What does ph(z) mean?

I see that apparently its called phase and its related to angles, but I am missing the other details.
 

Thread '2-sphere intrinsic definition by gluing disks' boundaries'

A sphere as topological manifold can be defined by gluing together the boundary of two disk. Basically one starts assigning each disk the subspace topology from ##\mathbb R^2## and then taking the quotient topology obtained by gluing their boundaries. Starting from the above definition of 2-sphere as topological manifold, shows that it is homeomorphic to the "embedded" sphere understood as subset of ##\mathbb R^3## in the subspace topology.
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