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Oct
13
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Oct
13
revised About smoothness of pasted function
added 214 characters in body
Oct
13
comment About smoothness of pasted function
Sorry. I forgot to write that in each boundary point $(x,y)$ $f(x,y)=g(x,y)$ and for each $\alpha$ and $(x,y)$ from boundary $D^\alpha f(x,y)=D^\alpha g(x,y)$.
Oct
12
asked About smoothness of pasted function