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Is this improper integral absolutely convergent?



The 2019 Stack Overflow Developer Survey Results Are InCould you help me with this improper integralImproper integral $sin(x)/x $ converges absolutely, conditionaly or diverges?This improper integral $int_1^+inftyxsinxsinx^4dx$ is absolutely convergent?Improper integral $int_0^infty fracsin(x)xdx$ - Showing convergence.Improper integral substitution hintDetermining if an integral is absolutely convergentUniform and absolute convergence of improper integralHow can I prove that the following improper integral is convergent?Is $int_0^+inftyfracsin ln xsqrt x,dx$ convergent or absolutely convergent?










-1












$begingroup$


Is the improper integral $displaystyle int_0^infty sin(x^2) ,dx$ absolutely convergent?










share|cite|improve this question











$endgroup$







  • 2




    $begingroup$
    No, it is not absolutely convergent.
    $endgroup$
    – Mark Viola
    Mar 23 at 18:30










  • $begingroup$
    Use the definition. Is $$int_0^infty | sin(x^2) | ,dx$$ convergent?
    $endgroup$
    – Yuriy S
    Mar 23 at 18:34











  • $begingroup$
    Note that $$int_0^inftysin(x^2)dxtoRe$$ but $$int_0^infty|sin(x^2)|dxtoinfty$$
    $endgroup$
    – Henry Lee
    Mar 23 at 18:42











  • $begingroup$
    Yes to $ pm 1, or its coefficient when approximated. Under expansion, no: it is a trascendent function which is divergent by definition.
    $endgroup$
    – Cppg
    Mar 23 at 20:24










  • $begingroup$
    $$int_0^+inftyleft|sin(x^2)right|,dx = frac12int_0^+inftyleft|sin xright|fracdxsqrtx$$ and $|sin x|$ has a positive mean value, so the integral is divergent.
    $endgroup$
    – Jack D'Aurizio
    Mar 23 at 22:11















-1












$begingroup$


Is the improper integral $displaystyle int_0^infty sin(x^2) ,dx$ absolutely convergent?










share|cite|improve this question











$endgroup$







  • 2




    $begingroup$
    No, it is not absolutely convergent.
    $endgroup$
    – Mark Viola
    Mar 23 at 18:30










  • $begingroup$
    Use the definition. Is $$int_0^infty | sin(x^2) | ,dx$$ convergent?
    $endgroup$
    – Yuriy S
    Mar 23 at 18:34











  • $begingroup$
    Note that $$int_0^inftysin(x^2)dxtoRe$$ but $$int_0^infty|sin(x^2)|dxtoinfty$$
    $endgroup$
    – Henry Lee
    Mar 23 at 18:42











  • $begingroup$
    Yes to $ pm 1, or its coefficient when approximated. Under expansion, no: it is a trascendent function which is divergent by definition.
    $endgroup$
    – Cppg
    Mar 23 at 20:24










  • $begingroup$
    $$int_0^+inftyleft|sin(x^2)right|,dx = frac12int_0^+inftyleft|sin xright|fracdxsqrtx$$ and $|sin x|$ has a positive mean value, so the integral is divergent.
    $endgroup$
    – Jack D'Aurizio
    Mar 23 at 22:11













-1












-1








-1





$begingroup$


Is the improper integral $displaystyle int_0^infty sin(x^2) ,dx$ absolutely convergent?










share|cite|improve this question











$endgroup$




Is the improper integral $displaystyle int_0^infty sin(x^2) ,dx$ absolutely convergent?







integration improper-integrals






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Mar 23 at 18:30









Mark Viola

134k1278177




134k1278177










asked Mar 23 at 18:28









user638057user638057

998




998







  • 2




    $begingroup$
    No, it is not absolutely convergent.
    $endgroup$
    – Mark Viola
    Mar 23 at 18:30










  • $begingroup$
    Use the definition. Is $$int_0^infty | sin(x^2) | ,dx$$ convergent?
    $endgroup$
    – Yuriy S
    Mar 23 at 18:34











  • $begingroup$
    Note that $$int_0^inftysin(x^2)dxtoRe$$ but $$int_0^infty|sin(x^2)|dxtoinfty$$
    $endgroup$
    – Henry Lee
    Mar 23 at 18:42











  • $begingroup$
    Yes to $ pm 1, or its coefficient when approximated. Under expansion, no: it is a trascendent function which is divergent by definition.
    $endgroup$
    – Cppg
    Mar 23 at 20:24










  • $begingroup$
    $$int_0^+inftyleft|sin(x^2)right|,dx = frac12int_0^+inftyleft|sin xright|fracdxsqrtx$$ and $|sin x|$ has a positive mean value, so the integral is divergent.
    $endgroup$
    – Jack D'Aurizio
    Mar 23 at 22:11












  • 2




    $begingroup$
    No, it is not absolutely convergent.
    $endgroup$
    – Mark Viola
    Mar 23 at 18:30










  • $begingroup$
    Use the definition. Is $$int_0^infty | sin(x^2) | ,dx$$ convergent?
    $endgroup$
    – Yuriy S
    Mar 23 at 18:34











  • $begingroup$
    Note that $$int_0^inftysin(x^2)dxtoRe$$ but $$int_0^infty|sin(x^2)|dxtoinfty$$
    $endgroup$
    – Henry Lee
    Mar 23 at 18:42











  • $begingroup$
    Yes to $ pm 1, or its coefficient when approximated. Under expansion, no: it is a trascendent function which is divergent by definition.
    $endgroup$
    – Cppg
    Mar 23 at 20:24










  • $begingroup$
    $$int_0^+inftyleft|sin(x^2)right|,dx = frac12int_0^+inftyleft|sin xright|fracdxsqrtx$$ and $|sin x|$ has a positive mean value, so the integral is divergent.
    $endgroup$
    – Jack D'Aurizio
    Mar 23 at 22:11







2




2




$begingroup$
No, it is not absolutely convergent.
$endgroup$
– Mark Viola
Mar 23 at 18:30




$begingroup$
No, it is not absolutely convergent.
$endgroup$
– Mark Viola
Mar 23 at 18:30












$begingroup$
Use the definition. Is $$int_0^infty | sin(x^2) | ,dx$$ convergent?
$endgroup$
– Yuriy S
Mar 23 at 18:34





$begingroup$
Use the definition. Is $$int_0^infty | sin(x^2) | ,dx$$ convergent?
$endgroup$
– Yuriy S
Mar 23 at 18:34













$begingroup$
Note that $$int_0^inftysin(x^2)dxtoRe$$ but $$int_0^infty|sin(x^2)|dxtoinfty$$
$endgroup$
– Henry Lee
Mar 23 at 18:42





$begingroup$
Note that $$int_0^inftysin(x^2)dxtoRe$$ but $$int_0^infty|sin(x^2)|dxtoinfty$$
$endgroup$
– Henry Lee
Mar 23 at 18:42













$begingroup$
Yes to $ pm 1, or its coefficient when approximated. Under expansion, no: it is a trascendent function which is divergent by definition.
$endgroup$
– Cppg
Mar 23 at 20:24




$begingroup$
Yes to $ pm 1, or its coefficient when approximated. Under expansion, no: it is a trascendent function which is divergent by definition.
$endgroup$
– Cppg
Mar 23 at 20:24












$begingroup$
$$int_0^+inftyleft|sin(x^2)right|,dx = frac12int_0^+inftyleft|sin xright|fracdxsqrtx$$ and $|sin x|$ has a positive mean value, so the integral is divergent.
$endgroup$
– Jack D'Aurizio
Mar 23 at 22:11




$begingroup$
$$int_0^+inftyleft|sin(x^2)right|,dx = frac12int_0^+inftyleft|sin xright|fracdxsqrtx$$ and $|sin x|$ has a positive mean value, so the integral is divergent.
$endgroup$
– Jack D'Aurizio
Mar 23 at 22:11










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