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Jun
14
comment Is composition of analytic functions itself analytic?
@Giuseppe Negro prove
Jun
14
comment Is composition of analytic functions itself analytic?
This requires first the proof that any differentiable complex function is analytic, which I think is a non-trivial theorem. Anyway, what about real analysis? Can this be proven without complex numbers?
Jun
14
comment Is composition of analytic functions itself analytic?
@Giuseppe Negro and what? these problems do not make it non-analytic and non-holomorphic.
Jun
14
revised No extension to complex numbers?
edited body
Jun
14
asked Is composition of analytic functions itself analytic?
Jun
14
answered No extension to complex numbers?
Jun
13
comment What is $\tan50^\circ$
@David H haha, very funny
Jun
13
comment What is $\tan50^\circ$
1.19175 is not the exact value.
May
27
asked Identify functions by their graphics
May
27
comment What makes elementary functions elementary?
|x| is not an elementary function.
May
17
answered What makes elementary functions elementary?
Apr
28
asked Is it possible to extend the complex plane affinely and projectively at the same time?
Apr
18
comment Maximum among $1, 2^{1/2}, 3^{1/3}, 4^{1/4},…$
what do you mean by "greatest absolute value from"?
Apr
18
comment Maximum among $1, 2^{1/2}, 3^{1/3}, 4^{1/4},…$
The closest number is not necessary the greater.
Apr
18
awarded  Excavator
Apr
18
comment Whats an extended complex plane?
@Daniel Fischer mathworld.wolfram.com/ExtendedComplexPlane.html
Apr
18
asked How the extension of complex plane with complex infinity $\tilde{\infty}$ coexists with extension of real line with positive infinity $\infty$?
Apr
18
revised Whats an extended complex plane?
complex infinity is denoted with tilde usually to distinguish from positive infuinity
Apr
18
suggested suggested edit on Whats an extended complex plane?
Apr
17
comment Is the theory of dual numbers strong enough to develop real analysis, and does it resemble Newton's historical method for doing calculus?
@Mike Battaglia maybe it causes problems with distributiveness of multiplication? $0/0=\epsilon^2 \omega^2=(\epsilon\omega)(\epsilon\omega)=1$.