Elementary problems solved with Functional Analysis

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP












5












$begingroup$


Many times people come and ask me what Functional Analysis is used for and why it's interesting. Of course interest is a matter of taste, and I for one love the subject as it is. There are far reaching applications to Physics, PDE, other areas of analysis and other advanced subjects that I wouldn't be able to demonstrate say to a first or even second year undergraduate student.



What about examples that can be stated in very simple terms, and are somehow "familiar" to the broader audience? I am not aware of classical or definitive examples, so I wanted to ask:
What are some (preferably mathematical) applications of Functional Analysis, that are as elementary as possible?










share|cite|improve this question











$endgroup$











  • $begingroup$
    Unfortunately, I don't think this question fits the format of the site - poll questions are explicitly off-topic here.
    $endgroup$
    – T. Bongers
    Jan 24 at 18:17






  • 1




    $begingroup$
    @T.Bongers Where should I post it then? I have seen several similar well received questions. Would slightly rephrasing the question help?
    $endgroup$
    – pitariver
    Jan 24 at 18:36











  • $begingroup$
    There are plenty of mathematical discussion forums around the internet, but MSE is not one of them. Historically, there were poll-based questions, but they frequently aren't seen as on-topic anymore.
    $endgroup$
    – T. Bongers
    Jan 24 at 19:12















5












$begingroup$


Many times people come and ask me what Functional Analysis is used for and why it's interesting. Of course interest is a matter of taste, and I for one love the subject as it is. There are far reaching applications to Physics, PDE, other areas of analysis and other advanced subjects that I wouldn't be able to demonstrate say to a first or even second year undergraduate student.



What about examples that can be stated in very simple terms, and are somehow "familiar" to the broader audience? I am not aware of classical or definitive examples, so I wanted to ask:
What are some (preferably mathematical) applications of Functional Analysis, that are as elementary as possible?










share|cite|improve this question











$endgroup$











  • $begingroup$
    Unfortunately, I don't think this question fits the format of the site - poll questions are explicitly off-topic here.
    $endgroup$
    – T. Bongers
    Jan 24 at 18:17






  • 1




    $begingroup$
    @T.Bongers Where should I post it then? I have seen several similar well received questions. Would slightly rephrasing the question help?
    $endgroup$
    – pitariver
    Jan 24 at 18:36











  • $begingroup$
    There are plenty of mathematical discussion forums around the internet, but MSE is not one of them. Historically, there were poll-based questions, but they frequently aren't seen as on-topic anymore.
    $endgroup$
    – T. Bongers
    Jan 24 at 19:12













5












5








5





$begingroup$


Many times people come and ask me what Functional Analysis is used for and why it's interesting. Of course interest is a matter of taste, and I for one love the subject as it is. There are far reaching applications to Physics, PDE, other areas of analysis and other advanced subjects that I wouldn't be able to demonstrate say to a first or even second year undergraduate student.



What about examples that can be stated in very simple terms, and are somehow "familiar" to the broader audience? I am not aware of classical or definitive examples, so I wanted to ask:
What are some (preferably mathematical) applications of Functional Analysis, that are as elementary as possible?










share|cite|improve this question











$endgroup$




Many times people come and ask me what Functional Analysis is used for and why it's interesting. Of course interest is a matter of taste, and I for one love the subject as it is. There are far reaching applications to Physics, PDE, other areas of analysis and other advanced subjects that I wouldn't be able to demonstrate say to a first or even second year undergraduate student.



What about examples that can be stated in very simple terms, and are somehow "familiar" to the broader audience? I am not aware of classical or definitive examples, so I wanted to ask:
What are some (preferably mathematical) applications of Functional Analysis, that are as elementary as possible?







real-analysis functional-analysis reference-request soft-question






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Jan 24 at 19:07







pitariver

















asked Jan 24 at 18:11









pitariverpitariver

349112




349112











  • $begingroup$
    Unfortunately, I don't think this question fits the format of the site - poll questions are explicitly off-topic here.
    $endgroup$
    – T. Bongers
    Jan 24 at 18:17






  • 1




    $begingroup$
    @T.Bongers Where should I post it then? I have seen several similar well received questions. Would slightly rephrasing the question help?
    $endgroup$
    – pitariver
    Jan 24 at 18:36











  • $begingroup$
    There are plenty of mathematical discussion forums around the internet, but MSE is not one of them. Historically, there were poll-based questions, but they frequently aren't seen as on-topic anymore.
    $endgroup$
    – T. Bongers
    Jan 24 at 19:12
















  • $begingroup$
    Unfortunately, I don't think this question fits the format of the site - poll questions are explicitly off-topic here.
    $endgroup$
    – T. Bongers
    Jan 24 at 18:17






  • 1




    $begingroup$
    @T.Bongers Where should I post it then? I have seen several similar well received questions. Would slightly rephrasing the question help?
    $endgroup$
    – pitariver
    Jan 24 at 18:36











  • $begingroup$
    There are plenty of mathematical discussion forums around the internet, but MSE is not one of them. Historically, there were poll-based questions, but they frequently aren't seen as on-topic anymore.
    $endgroup$
    – T. Bongers
    Jan 24 at 19:12















$begingroup$
Unfortunately, I don't think this question fits the format of the site - poll questions are explicitly off-topic here.
$endgroup$
– T. Bongers
Jan 24 at 18:17




$begingroup$
Unfortunately, I don't think this question fits the format of the site - poll questions are explicitly off-topic here.
$endgroup$
– T. Bongers
Jan 24 at 18:17




1




1




$begingroup$
@T.Bongers Where should I post it then? I have seen several similar well received questions. Would slightly rephrasing the question help?
$endgroup$
– pitariver
Jan 24 at 18:36





$begingroup$
@T.Bongers Where should I post it then? I have seen several similar well received questions. Would slightly rephrasing the question help?
$endgroup$
– pitariver
Jan 24 at 18:36













$begingroup$
There are plenty of mathematical discussion forums around the internet, but MSE is not one of them. Historically, there were poll-based questions, but they frequently aren't seen as on-topic anymore.
$endgroup$
– T. Bongers
Jan 24 at 19:12




$begingroup$
There are plenty of mathematical discussion forums around the internet, but MSE is not one of them. Historically, there were poll-based questions, but they frequently aren't seen as on-topic anymore.
$endgroup$
– T. Bongers
Jan 24 at 19:12










2 Answers
2






active

oldest

votes


















3












$begingroup$

A very important application is data compression, the theory of wavelets being particulary interesting here.






share|cite|improve this answer









$endgroup$




















    3












    $begingroup$

    My favorite application: Image/video/sound compression and denoising (and more generally, signal processing).
    From Fourier to Wavelet decomposition of signals, there is a plethora of techniques stemming from functional analysis for compressing and understanding signals. Examples:



    • Fourier analysis is the basis for JPEG compression (everyone knows JPEG, right?).

    • Wavelet and Fourier are both used in video compression.

    • Fourier is used a lot in sound denoising and filtering.

    • etc...





    share|cite|improve this answer









    $endgroup$












      Your Answer





      StackExchange.ifUsing("editor", function ()
      return StackExchange.using("mathjaxEditing", function ()
      StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
      StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
      );
      );
      , "mathjax-editing");

      StackExchange.ready(function()
      var channelOptions =
      tags: "".split(" "),
      id: "69"
      ;
      initTagRenderer("".split(" "), "".split(" "), channelOptions);

      StackExchange.using("externalEditor", function()
      // Have to fire editor after snippets, if snippets enabled
      if (StackExchange.settings.snippets.snippetsEnabled)
      StackExchange.using("snippets", function()
      createEditor();
      );

      else
      createEditor();

      );

      function createEditor()
      StackExchange.prepareEditor(
      heartbeatType: 'answer',
      autoActivateHeartbeat: false,
      convertImagesToLinks: true,
      noModals: true,
      showLowRepImageUploadWarning: true,
      reputationToPostImages: 10,
      bindNavPrevention: true,
      postfix: "",
      imageUploader:
      brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
      contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
      allowUrls: true
      ,
      noCode: true, onDemand: true,
      discardSelector: ".discard-answer"
      ,immediatelyShowMarkdownHelp:true
      );



      );













      draft saved

      draft discarded


















      StackExchange.ready(
      function ()
      StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3086196%2felementary-problems-solved-with-functional-analysis%23new-answer', 'question_page');

      );

      Post as a guest















      Required, but never shown

























      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      3












      $begingroup$

      A very important application is data compression, the theory of wavelets being particulary interesting here.






      share|cite|improve this answer









      $endgroup$

















        3












        $begingroup$

        A very important application is data compression, the theory of wavelets being particulary interesting here.






        share|cite|improve this answer









        $endgroup$















          3












          3








          3





          $begingroup$

          A very important application is data compression, the theory of wavelets being particulary interesting here.






          share|cite|improve this answer









          $endgroup$



          A very important application is data compression, the theory of wavelets being particulary interesting here.







          share|cite|improve this answer












          share|cite|improve this answer



          share|cite|improve this answer










          answered Jan 24 at 18:18









          José Carlos SantosJosé Carlos Santos

          161k22127232




          161k22127232





















              3












              $begingroup$

              My favorite application: Image/video/sound compression and denoising (and more generally, signal processing).
              From Fourier to Wavelet decomposition of signals, there is a plethora of techniques stemming from functional analysis for compressing and understanding signals. Examples:



              • Fourier analysis is the basis for JPEG compression (everyone knows JPEG, right?).

              • Wavelet and Fourier are both used in video compression.

              • Fourier is used a lot in sound denoising and filtering.

              • etc...





              share|cite|improve this answer









              $endgroup$

















                3












                $begingroup$

                My favorite application: Image/video/sound compression and denoising (and more generally, signal processing).
                From Fourier to Wavelet decomposition of signals, there is a plethora of techniques stemming from functional analysis for compressing and understanding signals. Examples:



                • Fourier analysis is the basis for JPEG compression (everyone knows JPEG, right?).

                • Wavelet and Fourier are both used in video compression.

                • Fourier is used a lot in sound denoising and filtering.

                • etc...





                share|cite|improve this answer









                $endgroup$















                  3












                  3








                  3





                  $begingroup$

                  My favorite application: Image/video/sound compression and denoising (and more generally, signal processing).
                  From Fourier to Wavelet decomposition of signals, there is a plethora of techniques stemming from functional analysis for compressing and understanding signals. Examples:



                  • Fourier analysis is the basis for JPEG compression (everyone knows JPEG, right?).

                  • Wavelet and Fourier are both used in video compression.

                  • Fourier is used a lot in sound denoising and filtering.

                  • etc...





                  share|cite|improve this answer









                  $endgroup$



                  My favorite application: Image/video/sound compression and denoising (and more generally, signal processing).
                  From Fourier to Wavelet decomposition of signals, there is a plethora of techniques stemming from functional analysis for compressing and understanding signals. Examples:



                  • Fourier analysis is the basis for JPEG compression (everyone knows JPEG, right?).

                  • Wavelet and Fourier are both used in video compression.

                  • Fourier is used a lot in sound denoising and filtering.

                  • etc...






                  share|cite|improve this answer












                  share|cite|improve this answer



                  share|cite|improve this answer










                  answered Jan 24 at 18:20









                  Stefan LafonStefan Lafon

                  1,89618




                  1,89618



























                      draft saved

                      draft discarded
















































                      Thanks for contributing an answer to Mathematics Stack Exchange!


                      • Please be sure to answer the question. Provide details and share your research!

                      But avoid


                      • Asking for help, clarification, or responding to other answers.

                      • Making statements based on opinion; back them up with references or personal experience.

                      Use MathJax to format equations. MathJax reference.


                      To learn more, see our tips on writing great answers.




                      draft saved


                      draft discarded














                      StackExchange.ready(
                      function ()
                      StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3086196%2felementary-problems-solved-with-functional-analysis%23new-answer', 'question_page');

                      );

                      Post as a guest















                      Required, but never shown





















































                      Required, but never shown














                      Required, but never shown












                      Required, but never shown







                      Required, but never shown

































                      Required, but never shown














                      Required, but never shown












                      Required, but never shown







                      Required, but never shown






                      Popular posts from this blog

                      How to check contact read email or not when send email to Individual?

                      Displaying single band from multi-band raster using QGIS

                      How many registers does an x86_64 CPU actually have?