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awarded  Famous Question 
Jun 26 
comment 
How did “normal” come to mean “perpendicular”?
@Emil Jeřábek o̯ is the laryngeal, ĝ is "palatal" or something(nobody knows what it was in reality). The later notation is common (e.g. as in Mallory & Adams, Fortson etc), so what are you referring to as "common notation"? 
Jun 26 
comment 
How did “normal” come to mean “perpendicular”?
@jnovacho yes, the both are from PIE root o̯reĝ (o̯reĝtos = right, correct, o̯reĝti = guides, directs, o̯reĝs = king, o̯reĝi̯om = kingdom etc) 
Jun 26 
comment 
How did “normal” come to mean “perpendicular”?
Can I suggest this to be moved to Linguistics.SE? 
Jun 24 
revised 
The functional equation $f(f(x))=x+f(x)^2$
added 1 character in body 
Jun 24 
revised 
The functional equation $f(f(x))=x+f(x)^2$
deleted 4 characters in body 
Jun 20 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
Oh sorry, I see 
Jun 18 
revised 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
fix wording 
Jun 18 
suggested  suggested edit on If two functions are equal to their Newton series, is their composition also equal to its Newton series? 
Jun 17 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
So it is good to know that this somehow touches your prevuous research. 
Jun 17 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
I doubt that is accurate for someone who has theorems in textbooks named after him. 
Jun 17 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
Sorry I would not ask this, should I know that you're a renowned mathematician. Still your proof is explained in too difficult language at least for me to comprehend. 
Jun 17 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
I have accepted this answer, although I would prefer it be posted in the linked question. Can you please tell, did you derive this theorem yourself or had you seen it before? 
Jun 17 
accepted  If two functions are equal to their Newton series, is their composition also equal to its Newton series? 
Jun 17 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
@fedja What's up with the proof? Can we resonably hope to see it? 
Jun 15 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
@fedja if you have a link to this property as you stated, this would be a great answer to this question, at least the first part: mathoverflow.net/questions/71206/discreteanalyticfunctions 
Jun 15 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
@fedja how do u know that the Newton series for such function converges? 
Jun 15 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
@fedja $\sin (\frac{\pi x}{2})$ is entire function? Yes. I suppose its order is less than 1. It does not have convergent Newton series. See here: mathoverflow.net/questions/99166/… 
Jun 15 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
@fedja by the way, another question is, will a nonzero function which vanishes at any square of integer have its Newton series converging? 
Jun 15 
comment 
If two functions are equal to their Newton series, is their composition also equal to its Newton series?
@fedja interesting, but at what conditions it holds then? 