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 Yearling
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Jan
15
comment What is lower limit condition of a surface of a tetrahedron?
Can we have only one lower condition ? or impossible. If it exists, it should be cyclic .for example, the lower condition could be $|S_2-S_3|+|S_3-S_4|+|S_2-S_4|<S_1$ but I do not know if it exists such cyclic condition or how to prove that it is impossible to eliminate 3 necessary condition into one condition.
Jan
14
revised What is lower limit condition of a surface of a tetrahedron?
edited title
Jan
13
asked What is lower limit condition of a surface of a tetrahedron?
Jan
11
revised Proof that $\sum\limits_{k=1}^nk^2 = \frac{n(n+1)(2n+1)}{6}$?
I corrected mistyped 3 as 2
Jan
7
revised How can I solve the differential equation $y'+y^{2}=f(x)$?
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Jan
7
revised How can I solve the differential equation $y'+y^{2}=f(x)$?
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Jan
5
comment $e^x(\ln x-c) =\sum \limits_{k=0}^\infty \frac{ x^{k} \Gamma'(k+1)}{ (k!)^2}$ Is it correct result?
I have asked a question in math.overflow that is related to your computation a long time ago. mathoverflow.net/questions/227642/… . I saw your comment about your result. Thanks a lot for your comment. It is very supporting comment but the question is voted as off-topic. . I am sure that it is very interesting and helpful topic question. Could you please edit my question in overflow for more formal mathematical perspective? Thanks
Jan
5
awarded  Yearling
Jan
4
revised What is the derivative of: $f(x)=x^{2x^{3x^{4x^{5x^{6x^{7x^{.{^{.^{.}}}}}}}}}}$?
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Dec
30
revised What is the derivative of: $f(x)=x^{2x^{3x^{4x^{5x^{6x^{7x^{.{^{.^{.}}}}}}}}}}$?
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Dec
29
revised What is the derivative of: $f(x)=x^{2x^{3x^{4x^{5x^{6x^{7x^{.{^{.^{.}}}}}}}}}}$?
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Dec
29
revised What is the derivative of: $f(x)=x^{2x^{3x^{4x^{5x^{6x^{7x^{.{^{.^{.}}}}}}}}}}$?
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Dec
29
revised What is the derivative of: $f(x)=x^{2x^{3x^{4x^{5x^{6x^{7x^{.{^{.^{.}}}}}}}}}}$?
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Dec
29
answered What is the derivative of: $f(x)=x^{2x^{3x^{4x^{5x^{6x^{7x^{.{^{.^{.}}}}}}}}}}$?
Nov
30
awarded  Popular Question
Nov
4
comment Show $F(z)=\int_{0}^{1}{g(t)\over t-z}dt$ is holomorphic in $\Bbb{C}\setminus[0,1]$. Limit problem.
Please check Leibniz integral rule. The proof has similiar idea. en.wikipedia.org/wiki/Leibniz_integral_rule#Proofs Then have a look the title 'General form with variable limits' in the page
Nov
4
comment Show $F(z)=\int_{0}^{1}{g(t)\over t-z}dt$ is holomorphic in $\Bbb{C}\setminus[0,1]$. Limit problem.
The integral depends on $t$ but we take limit on $h$.
Nov
4
revised Show $F(z)=\int_{0}^{1}{g(t)\over t-z}dt$ is holomorphic in $\Bbb{C}\setminus[0,1]$. Limit problem.
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Nov
4
revised Show $F(z)=\int_{0}^{1}{g(t)\over t-z}dt$ is holomorphic in $\Bbb{C}\setminus[0,1]$. Limit problem.
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Nov
4
answered Show $F(z)=\int_{0}^{1}{g(t)\over t-z}dt$ is holomorphic in $\Bbb{C}\setminus[0,1]$. Limit problem.