Why is $inf g sup g = frac{9}{16} $?











up vote
2
down vote

favorite
3












Consider this question here :



Why is $sup f_- (n) inf f_+ (m) = frac{5}{4} $?



Call that conjecture about $frac{5}{4} $ conjecture $1$.



Let $g(n) = prod_{i=0}^n (sin^2(n) + frac{9}{16}) ) $



Conjecture $3$ :



——-



Conjecture $2$ is :



$$ sup g(n) space inf g(n) = frac{9}{16} $$



And this follows from conjecture $1$ or vice versa.



——-



It feels like this second conjecture could somehow follow from the first conjecture since



$$-(cos(n) + frac{5}{4})(cos(n) - frac{5}{4}) = - cos^2(n) + frac{25}{16} = sin^2(n) + frac{9}{16} $$



This question is about the connection ( conjecture $3$).



If you can prove conjecture $1$ or $2$ post it in the other thread.



Btw $ int_0^{2 pi} ln(sin^2(x) + frac{9}{16}) dx = 0 $ indeed as you probably already knew or guessed.










share|cite|improve this question


























    up vote
    2
    down vote

    favorite
    3












    Consider this question here :



    Why is $sup f_- (n) inf f_+ (m) = frac{5}{4} $?



    Call that conjecture about $frac{5}{4} $ conjecture $1$.



    Let $g(n) = prod_{i=0}^n (sin^2(n) + frac{9}{16}) ) $



    Conjecture $3$ :



    ——-



    Conjecture $2$ is :



    $$ sup g(n) space inf g(n) = frac{9}{16} $$



    And this follows from conjecture $1$ or vice versa.



    ——-



    It feels like this second conjecture could somehow follow from the first conjecture since



    $$-(cos(n) + frac{5}{4})(cos(n) - frac{5}{4}) = - cos^2(n) + frac{25}{16} = sin^2(n) + frac{9}{16} $$



    This question is about the connection ( conjecture $3$).



    If you can prove conjecture $1$ or $2$ post it in the other thread.



    Btw $ int_0^{2 pi} ln(sin^2(x) + frac{9}{16}) dx = 0 $ indeed as you probably already knew or guessed.










    share|cite|improve this question
























      up vote
      2
      down vote

      favorite
      3









      up vote
      2
      down vote

      favorite
      3






      3





      Consider this question here :



      Why is $sup f_- (n) inf f_+ (m) = frac{5}{4} $?



      Call that conjecture about $frac{5}{4} $ conjecture $1$.



      Let $g(n) = prod_{i=0}^n (sin^2(n) + frac{9}{16}) ) $



      Conjecture $3$ :



      ——-



      Conjecture $2$ is :



      $$ sup g(n) space inf g(n) = frac{9}{16} $$



      And this follows from conjecture $1$ or vice versa.



      ——-



      It feels like this second conjecture could somehow follow from the first conjecture since



      $$-(cos(n) + frac{5}{4})(cos(n) - frac{5}{4}) = - cos^2(n) + frac{25}{16} = sin^2(n) + frac{9}{16} $$



      This question is about the connection ( conjecture $3$).



      If you can prove conjecture $1$ or $2$ post it in the other thread.



      Btw $ int_0^{2 pi} ln(sin^2(x) + frac{9}{16}) dx = 0 $ indeed as you probably already knew or guessed.










      share|cite|improve this question













      Consider this question here :



      Why is $sup f_- (n) inf f_+ (m) = frac{5}{4} $?



      Call that conjecture about $frac{5}{4} $ conjecture $1$.



      Let $g(n) = prod_{i=0}^n (sin^2(n) + frac{9}{16}) ) $



      Conjecture $3$ :



      ——-



      Conjecture $2$ is :



      $$ sup g(n) space inf g(n) = frac{9}{16} $$



      And this follows from conjecture $1$ or vice versa.



      ——-



      It feels like this second conjecture could somehow follow from the first conjecture since



      $$-(cos(n) + frac{5}{4})(cos(n) - frac{5}{4}) = - cos^2(n) + frac{25}{16} = sin^2(n) + frac{9}{16} $$



      This question is about the connection ( conjecture $3$).



      If you can prove conjecture $1$ or $2$ post it in the other thread.



      Btw $ int_0^{2 pi} ln(sin^2(x) + frac{9}{16}) dx = 0 $ indeed as you probably already knew or guessed.







      calculus geometry fractions limsup-and-liminf products






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked Nov 15 at 22:45









      mick

      5,01322063




      5,01322063



























          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%2f3000441%2fwhy-is-inf-g-sup-g-frac916%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%2f3000441%2fwhy-is-inf-g-sup-g-frac916%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

          Ellipse (mathématiques)

          Quarter-circle Tiles

          Mont Emei