Definition talk:Differentiable Mapping/Real-Valued Function/Point/Definition 1

I see your question on the validity of this definition. It originated from someone who posted up a number of unsourced work based on his own ideas and understanding.

Please feel free to amend it (and the other definition) according to how you believe it should go.

If you can do so, please also give some indication of what can be used as a reliable source work. --prime mover (talk) 05:20, 8 October 2020 (UTC)