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## Main Question or Discussion Point

I understand the definition of continuity on a manifold based on open sets. I was questionning myself about what is the corresponding physical meaning of an open set of a manifold (M, Power-set-of-M, Atlas). Is it a simple (maybe simplest) assumption in order to define mathematically continuity?

Sorry I cannot help not questionning everything :-)

I am ''open'' to any reading references that can help.

Thank you, AlephClo

Sorry I cannot help not questionning everything :-)

I am ''open'' to any reading references that can help.

Thank you, AlephClo