On the behavior of $|zeta(1/2 + it)|$ for $tin(-14,14)$












1














Denote by $zeta$ the Riemann zeta function.
Since $zeta(1/2 + it)neq 0$ for $|t|leq 14$, it seems to follow that $|zeta(1/2 + it)|$ is either strictly decreasing or strictly increasing on $(-14,14)$. But what exactly is the behaviour of $|zeta(1/2 +it)|$ on this region ? I mean, is it strictly increasing or is it strictly decreasing ?



A graphical sketch might help.










share|cite|improve this question





























    1














    Denote by $zeta$ the Riemann zeta function.
    Since $zeta(1/2 + it)neq 0$ for $|t|leq 14$, it seems to follow that $|zeta(1/2 + it)|$ is either strictly decreasing or strictly increasing on $(-14,14)$. But what exactly is the behaviour of $|zeta(1/2 +it)|$ on this region ? I mean, is it strictly increasing or is it strictly decreasing ?



    A graphical sketch might help.










    share|cite|improve this question



























      1












      1








      1







      Denote by $zeta$ the Riemann zeta function.
      Since $zeta(1/2 + it)neq 0$ for $|t|leq 14$, it seems to follow that $|zeta(1/2 + it)|$ is either strictly decreasing or strictly increasing on $(-14,14)$. But what exactly is the behaviour of $|zeta(1/2 +it)|$ on this region ? I mean, is it strictly increasing or is it strictly decreasing ?



      A graphical sketch might help.










      share|cite|improve this question















      Denote by $zeta$ the Riemann zeta function.
      Since $zeta(1/2 + it)neq 0$ for $|t|leq 14$, it seems to follow that $|zeta(1/2 + it)|$ is either strictly decreasing or strictly increasing on $(-14,14)$. But what exactly is the behaviour of $|zeta(1/2 +it)|$ on this region ? I mean, is it strictly increasing or is it strictly decreasing ?



      A graphical sketch might help.







      number-theory analytic-number-theory riemann-zeta






      share|cite|improve this question















      share|cite|improve this question













      share|cite|improve this question




      share|cite|improve this question








      edited Nov 29 at 19:55

























      asked Nov 29 at 19:36







      user507152





























          1 Answer
          1






          active

          oldest

          votes


















          1














          It doesn't follow that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing.



          In fact, since $lvert zeta(1/2 + it)rvert = lvert zeta(1/2 - it) rvert$ from the functional equation, one cannot have that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing at $0$, since the function is symmetric there.



          One can plot this readily using something like sage, or something online like wolfram alpha. You get the following plot.



          enter image description here






          share|cite|improve this answer























            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%2f3019090%2fon-the-behavior-of-zeta1-2-it-for-t-in-14-14%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown
























            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            It doesn't follow that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing.



            In fact, since $lvert zeta(1/2 + it)rvert = lvert zeta(1/2 - it) rvert$ from the functional equation, one cannot have that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing at $0$, since the function is symmetric there.



            One can plot this readily using something like sage, or something online like wolfram alpha. You get the following plot.



            enter image description here






            share|cite|improve this answer




























              1














              It doesn't follow that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing.



              In fact, since $lvert zeta(1/2 + it)rvert = lvert zeta(1/2 - it) rvert$ from the functional equation, one cannot have that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing at $0$, since the function is symmetric there.



              One can plot this readily using something like sage, or something online like wolfram alpha. You get the following plot.



              enter image description here






              share|cite|improve this answer


























                1












                1








                1






                It doesn't follow that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing.



                In fact, since $lvert zeta(1/2 + it)rvert = lvert zeta(1/2 - it) rvert$ from the functional equation, one cannot have that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing at $0$, since the function is symmetric there.



                One can plot this readily using something like sage, or something online like wolfram alpha. You get the following plot.



                enter image description here






                share|cite|improve this answer














                It doesn't follow that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing.



                In fact, since $lvert zeta(1/2 + it)rvert = lvert zeta(1/2 - it) rvert$ from the functional equation, one cannot have that $lvert zeta(1/2 + it) rvert$ is strictly increasing or decreasing at $0$, since the function is symmetric there.



                One can plot this readily using something like sage, or something online like wolfram alpha. You get the following plot.



                enter image description here







                share|cite|improve this answer














                share|cite|improve this answer



                share|cite|improve this answer








                edited Nov 29 at 20:03

























                answered Nov 29 at 19:54









                davidlowryduda

                74.3k7117251




                74.3k7117251






























                    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.





                    Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


                    Please pay close attention to the following guidance:


                    • 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.


                    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%2f3019090%2fon-the-behavior-of-zeta1-2-it-for-t-in-14-14%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

                    Berounka

                    Sphinx de Gizeh

                    Different font size/position of beamer's navigation symbols template's content depending on regular/plain...