Is this a valid exercise?












0












$begingroup$


In Needham's Visual Complex analysis he sets the following exercise - Chapter 12 ex 12(i) on page 571:



Consider the image under an analytic mapping $f$ of a source of strength $S$ located at $p$.



(i) show geometrically, then algebraically, that if $p$ is not a critical point of $f$ (i.e., $f'(p)neq 0$) then the image is another source of strength $S$ at $f(p)$.



[A source of this type is given by $V=(S/2pi)(1/(overline{z}-overline{p})$]



I don't want a solution to the exercise because I want to try it myself, but I'm not convinced that it's a valid exercise because if $f$ is a general analytic function how can we be so specific about the image of the mapping?










share|cite|improve this question











$endgroup$

















    0












    $begingroup$


    In Needham's Visual Complex analysis he sets the following exercise - Chapter 12 ex 12(i) on page 571:



    Consider the image under an analytic mapping $f$ of a source of strength $S$ located at $p$.



    (i) show geometrically, then algebraically, that if $p$ is not a critical point of $f$ (i.e., $f'(p)neq 0$) then the image is another source of strength $S$ at $f(p)$.



    [A source of this type is given by $V=(S/2pi)(1/(overline{z}-overline{p})$]



    I don't want a solution to the exercise because I want to try it myself, but I'm not convinced that it's a valid exercise because if $f$ is a general analytic function how can we be so specific about the image of the mapping?










    share|cite|improve this question











    $endgroup$















      0












      0








      0





      $begingroup$


      In Needham's Visual Complex analysis he sets the following exercise - Chapter 12 ex 12(i) on page 571:



      Consider the image under an analytic mapping $f$ of a source of strength $S$ located at $p$.



      (i) show geometrically, then algebraically, that if $p$ is not a critical point of $f$ (i.e., $f'(p)neq 0$) then the image is another source of strength $S$ at $f(p)$.



      [A source of this type is given by $V=(S/2pi)(1/(overline{z}-overline{p})$]



      I don't want a solution to the exercise because I want to try it myself, but I'm not convinced that it's a valid exercise because if $f$ is a general analytic function how can we be so specific about the image of the mapping?










      share|cite|improve this question











      $endgroup$




      In Needham's Visual Complex analysis he sets the following exercise - Chapter 12 ex 12(i) on page 571:



      Consider the image under an analytic mapping $f$ of a source of strength $S$ located at $p$.



      (i) show geometrically, then algebraically, that if $p$ is not a critical point of $f$ (i.e., $f'(p)neq 0$) then the image is another source of strength $S$ at $f(p)$.



      [A source of this type is given by $V=(S/2pi)(1/(overline{z}-overline{p})$]



      I don't want a solution to the exercise because I want to try it myself, but I'm not convinced that it's a valid exercise because if $f$ is a general analytic function how can we be so specific about the image of the mapping?







      complex-analysis






      share|cite|improve this question















      share|cite|improve this question













      share|cite|improve this question




      share|cite|improve this question








      edited Jan 27 at 19:20







      Ian Taylor

















      asked Jan 27 at 16:30









      Ian TaylorIan Taylor

      517




      517






















          0






          active

          oldest

          votes











          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%2f3089774%2fis-this-a-valid-exercise%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          0






          active

          oldest

          votes








          0






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















          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%2f3089774%2fis-this-a-valid-exercise%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

          'app-layout' is not a known element: how to share Component with different Modules

          android studio warns about leanback feature tag usage required on manifest while using Unity exported app?

          WPF add header to Image with URL pettitions [duplicate]