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Jan 30, 2014 at 17:25 comment added Delio Mugnolo Interesting. When did then functions of - say - two spacial variables begin to be studied? I would guess that this must have been common at latest at the time of D'Alembert (PDEs with physical motivation etc.), but perhaps you have a sharper estimate?
Jan 29, 2014 at 22:47 review First posts
Jan 29, 2014 at 22:51
Jan 29, 2014 at 22:31 history answered Viktor Blasjo CC BY-SA 3.0