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Feb 22, 2011 at 9:25 comment added Zen Harper I think it's purely a matter of choice, with no universal agreement; in any specific example, just make sure you say "one-sided derivative" or "extendable function" etc. to make clear what you mean. I've seen a variety of different conventions in use.
Feb 19, 2011 at 9:25 comment added Willie Wong As a remark: this is why in most books/paper you only see continuity and differentiability specified on open domains with possibly the additional assumption of "... extends continuously to the boundary". Note that in more than 1 dimensions, continuous extension to the boundary is more than just issue of blow-up on the boundary point, but also continuity on the boundary which is now more than 0 dimensional.
Feb 18, 2011 at 19:56 history asked James Propp CC BY-SA 2.5