Transform integrals onto the unit square











up vote
0
down vote

favorite












Let $t$ denote an arbitrary triangle in the 2-dimensional mesh and let $hat{t}$ denote the reference triangle. Given are also two integrals: $$I_t(g) = int_t g(x) dx $$ and $$J_t(g) = int_t nabla g(x) dx $$ for $x in mathbb R^2$.



Now, if $$phi: (0,1)^2 to hat{t} $$ $$(epsilon, n) to (epsilon, (1-epsilon) n)$$



Can anyone transform the integrals $I_t$ and $J_t$ onto the unit square via $hat{t}$ ?










share|cite|improve this question


























    up vote
    0
    down vote

    favorite












    Let $t$ denote an arbitrary triangle in the 2-dimensional mesh and let $hat{t}$ denote the reference triangle. Given are also two integrals: $$I_t(g) = int_t g(x) dx $$ and $$J_t(g) = int_t nabla g(x) dx $$ for $x in mathbb R^2$.



    Now, if $$phi: (0,1)^2 to hat{t} $$ $$(epsilon, n) to (epsilon, (1-epsilon) n)$$



    Can anyone transform the integrals $I_t$ and $J_t$ onto the unit square via $hat{t}$ ?










    share|cite|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      Let $t$ denote an arbitrary triangle in the 2-dimensional mesh and let $hat{t}$ denote the reference triangle. Given are also two integrals: $$I_t(g) = int_t g(x) dx $$ and $$J_t(g) = int_t nabla g(x) dx $$ for $x in mathbb R^2$.



      Now, if $$phi: (0,1)^2 to hat{t} $$ $$(epsilon, n) to (epsilon, (1-epsilon) n)$$



      Can anyone transform the integrals $I_t$ and $J_t$ onto the unit square via $hat{t}$ ?










      share|cite|improve this question













      Let $t$ denote an arbitrary triangle in the 2-dimensional mesh and let $hat{t}$ denote the reference triangle. Given are also two integrals: $$I_t(g) = int_t g(x) dx $$ and $$J_t(g) = int_t nabla g(x) dx $$ for $x in mathbb R^2$.



      Now, if $$phi: (0,1)^2 to hat{t} $$ $$(epsilon, n) to (epsilon, (1-epsilon) n)$$



      Can anyone transform the integrals $I_t$ and $J_t$ onto the unit square via $hat{t}$ ?







      geometry numerical-methods transformation






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked 12 hours ago









      StMan

      1337




      1337



























          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',
          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%2f3000876%2ftransform-integrals-onto-the-unit-square%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown






























          active

          oldest

          votes













          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















           

          draft saved


          draft discarded



















































           


          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3000876%2ftransform-integrals-onto-the-unit-square%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

          Le Mesnil-Réaume

          Ida-Boy-Ed-Garten

          web3.py web3.isConnected() returns false always