Operator Semigroups Simplified












2












$begingroup$


How do I explain Operator Semigroups, in particular, positive operator semigroups to someone who hasn't studied math beyond high school?



I just want to give a vague idea/analogy to someone to let them know a bit about my a project I am working on.










share|cite|improve this question









$endgroup$












  • $begingroup$
    It depends on what you are doing with them. I don't think just explaining what they are is particularly motivating.
    $endgroup$
    – Don Thousand
    Jan 22 at 18:09










  • $begingroup$
    @DonThousand Right now, I am just studying Positive Operator Semigroups. However, I just want to give someone from a non-math background a rough idea of what I'm studying. How do I do that without getting technical?
    $endgroup$
    – Mark
    Jan 22 at 18:12










  • $begingroup$
    Wikipedia provides a good starting point.
    $endgroup$
    – Don Thousand
    Jan 22 at 18:19










  • $begingroup$
    Were you likely to understand positive operator semigroups when you were in High School?
    $endgroup$
    – DisintegratingByParts
    Jan 23 at 7:30










  • $begingroup$
    @DisintegratingByParts I don't really want them to completely understand. Something like a real-world application or analogy of sorts. Just give a really basic idea.
    $endgroup$
    – Mark
    Jan 23 at 10:12
















2












$begingroup$


How do I explain Operator Semigroups, in particular, positive operator semigroups to someone who hasn't studied math beyond high school?



I just want to give a vague idea/analogy to someone to let them know a bit about my a project I am working on.










share|cite|improve this question









$endgroup$












  • $begingroup$
    It depends on what you are doing with them. I don't think just explaining what they are is particularly motivating.
    $endgroup$
    – Don Thousand
    Jan 22 at 18:09










  • $begingroup$
    @DonThousand Right now, I am just studying Positive Operator Semigroups. However, I just want to give someone from a non-math background a rough idea of what I'm studying. How do I do that without getting technical?
    $endgroup$
    – Mark
    Jan 22 at 18:12










  • $begingroup$
    Wikipedia provides a good starting point.
    $endgroup$
    – Don Thousand
    Jan 22 at 18:19










  • $begingroup$
    Were you likely to understand positive operator semigroups when you were in High School?
    $endgroup$
    – DisintegratingByParts
    Jan 23 at 7:30










  • $begingroup$
    @DisintegratingByParts I don't really want them to completely understand. Something like a real-world application or analogy of sorts. Just give a really basic idea.
    $endgroup$
    – Mark
    Jan 23 at 10:12














2












2








2





$begingroup$


How do I explain Operator Semigroups, in particular, positive operator semigroups to someone who hasn't studied math beyond high school?



I just want to give a vague idea/analogy to someone to let them know a bit about my a project I am working on.










share|cite|improve this question









$endgroup$




How do I explain Operator Semigroups, in particular, positive operator semigroups to someone who hasn't studied math beyond high school?



I just want to give a vague idea/analogy to someone to let them know a bit about my a project I am working on.







functional-analysis operator-theory semigroup-of-operators






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Jan 22 at 18:04









MarkMark

433315




433315












  • $begingroup$
    It depends on what you are doing with them. I don't think just explaining what they are is particularly motivating.
    $endgroup$
    – Don Thousand
    Jan 22 at 18:09










  • $begingroup$
    @DonThousand Right now, I am just studying Positive Operator Semigroups. However, I just want to give someone from a non-math background a rough idea of what I'm studying. How do I do that without getting technical?
    $endgroup$
    – Mark
    Jan 22 at 18:12










  • $begingroup$
    Wikipedia provides a good starting point.
    $endgroup$
    – Don Thousand
    Jan 22 at 18:19










  • $begingroup$
    Were you likely to understand positive operator semigroups when you were in High School?
    $endgroup$
    – DisintegratingByParts
    Jan 23 at 7:30










  • $begingroup$
    @DisintegratingByParts I don't really want them to completely understand. Something like a real-world application or analogy of sorts. Just give a really basic idea.
    $endgroup$
    – Mark
    Jan 23 at 10:12


















  • $begingroup$
    It depends on what you are doing with them. I don't think just explaining what they are is particularly motivating.
    $endgroup$
    – Don Thousand
    Jan 22 at 18:09










  • $begingroup$
    @DonThousand Right now, I am just studying Positive Operator Semigroups. However, I just want to give someone from a non-math background a rough idea of what I'm studying. How do I do that without getting technical?
    $endgroup$
    – Mark
    Jan 22 at 18:12










  • $begingroup$
    Wikipedia provides a good starting point.
    $endgroup$
    – Don Thousand
    Jan 22 at 18:19










  • $begingroup$
    Were you likely to understand positive operator semigroups when you were in High School?
    $endgroup$
    – DisintegratingByParts
    Jan 23 at 7:30










  • $begingroup$
    @DisintegratingByParts I don't really want them to completely understand. Something like a real-world application or analogy of sorts. Just give a really basic idea.
    $endgroup$
    – Mark
    Jan 23 at 10:12
















$begingroup$
It depends on what you are doing with them. I don't think just explaining what they are is particularly motivating.
$endgroup$
– Don Thousand
Jan 22 at 18:09




$begingroup$
It depends on what you are doing with them. I don't think just explaining what they are is particularly motivating.
$endgroup$
– Don Thousand
Jan 22 at 18:09












$begingroup$
@DonThousand Right now, I am just studying Positive Operator Semigroups. However, I just want to give someone from a non-math background a rough idea of what I'm studying. How do I do that without getting technical?
$endgroup$
– Mark
Jan 22 at 18:12




$begingroup$
@DonThousand Right now, I am just studying Positive Operator Semigroups. However, I just want to give someone from a non-math background a rough idea of what I'm studying. How do I do that without getting technical?
$endgroup$
– Mark
Jan 22 at 18:12












$begingroup$
Wikipedia provides a good starting point.
$endgroup$
– Don Thousand
Jan 22 at 18:19




$begingroup$
Wikipedia provides a good starting point.
$endgroup$
– Don Thousand
Jan 22 at 18:19












$begingroup$
Were you likely to understand positive operator semigroups when you were in High School?
$endgroup$
– DisintegratingByParts
Jan 23 at 7:30




$begingroup$
Were you likely to understand positive operator semigroups when you were in High School?
$endgroup$
– DisintegratingByParts
Jan 23 at 7:30












$begingroup$
@DisintegratingByParts I don't really want them to completely understand. Something like a real-world application or analogy of sorts. Just give a really basic idea.
$endgroup$
– Mark
Jan 23 at 10:12




$begingroup$
@DisintegratingByParts I don't really want them to completely understand. Something like a real-world application or analogy of sorts. Just give a really basic idea.
$endgroup$
– Mark
Jan 23 at 10:12










1 Answer
1






active

oldest

votes


















2












$begingroup$

How do I explain Operator Semigroups to someone who hasn't studied math beyond high school? I just want to give a vague idea/analogy. I don't really want them to completely understand.



Maybe, a possible analogy is the exponential function: you are studying a generalization of $f(t)=e^{a t}$ which allow ''matrix exponents''.




  • But why would anyone want to study things like that?


Because, as we know that the said function is the solution of some important problems, we expect that the said generalization is the solution of some important generalized problems.




  • What are these problems?


They are the functional equation
$$f(x+y)=f(x)f(y)$$
and the differential equation
$$f'(x)=af(x).$$
If we assume that $f$ is real-valued, then a solution is the exponential function $f(t)=e^{at}$. If we assume that $f$ is matrix-valued, then a solution will be given by a ''matrix exponential''. If we want go one step further (which have important applications), we will need semigroup of operators. Here is where your project starts.






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%2f3083483%2foperator-semigroups-simplified%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









    2












    $begingroup$

    How do I explain Operator Semigroups to someone who hasn't studied math beyond high school? I just want to give a vague idea/analogy. I don't really want them to completely understand.



    Maybe, a possible analogy is the exponential function: you are studying a generalization of $f(t)=e^{a t}$ which allow ''matrix exponents''.




    • But why would anyone want to study things like that?


    Because, as we know that the said function is the solution of some important problems, we expect that the said generalization is the solution of some important generalized problems.




    • What are these problems?


    They are the functional equation
    $$f(x+y)=f(x)f(y)$$
    and the differential equation
    $$f'(x)=af(x).$$
    If we assume that $f$ is real-valued, then a solution is the exponential function $f(t)=e^{at}$. If we assume that $f$ is matrix-valued, then a solution will be given by a ''matrix exponential''. If we want go one step further (which have important applications), we will need semigroup of operators. Here is where your project starts.






    share|cite|improve this answer









    $endgroup$


















      2












      $begingroup$

      How do I explain Operator Semigroups to someone who hasn't studied math beyond high school? I just want to give a vague idea/analogy. I don't really want them to completely understand.



      Maybe, a possible analogy is the exponential function: you are studying a generalization of $f(t)=e^{a t}$ which allow ''matrix exponents''.




      • But why would anyone want to study things like that?


      Because, as we know that the said function is the solution of some important problems, we expect that the said generalization is the solution of some important generalized problems.




      • What are these problems?


      They are the functional equation
      $$f(x+y)=f(x)f(y)$$
      and the differential equation
      $$f'(x)=af(x).$$
      If we assume that $f$ is real-valued, then a solution is the exponential function $f(t)=e^{at}$. If we assume that $f$ is matrix-valued, then a solution will be given by a ''matrix exponential''. If we want go one step further (which have important applications), we will need semigroup of operators. Here is where your project starts.






      share|cite|improve this answer









      $endgroup$
















        2












        2








        2





        $begingroup$

        How do I explain Operator Semigroups to someone who hasn't studied math beyond high school? I just want to give a vague idea/analogy. I don't really want them to completely understand.



        Maybe, a possible analogy is the exponential function: you are studying a generalization of $f(t)=e^{a t}$ which allow ''matrix exponents''.




        • But why would anyone want to study things like that?


        Because, as we know that the said function is the solution of some important problems, we expect that the said generalization is the solution of some important generalized problems.




        • What are these problems?


        They are the functional equation
        $$f(x+y)=f(x)f(y)$$
        and the differential equation
        $$f'(x)=af(x).$$
        If we assume that $f$ is real-valued, then a solution is the exponential function $f(t)=e^{at}$. If we assume that $f$ is matrix-valued, then a solution will be given by a ''matrix exponential''. If we want go one step further (which have important applications), we will need semigroup of operators. Here is where your project starts.






        share|cite|improve this answer









        $endgroup$



        How do I explain Operator Semigroups to someone who hasn't studied math beyond high school? I just want to give a vague idea/analogy. I don't really want them to completely understand.



        Maybe, a possible analogy is the exponential function: you are studying a generalization of $f(t)=e^{a t}$ which allow ''matrix exponents''.




        • But why would anyone want to study things like that?


        Because, as we know that the said function is the solution of some important problems, we expect that the said generalization is the solution of some important generalized problems.




        • What are these problems?


        They are the functional equation
        $$f(x+y)=f(x)f(y)$$
        and the differential equation
        $$f'(x)=af(x).$$
        If we assume that $f$ is real-valued, then a solution is the exponential function $f(t)=e^{at}$. If we assume that $f$ is matrix-valued, then a solution will be given by a ''matrix exponential''. If we want go one step further (which have important applications), we will need semigroup of operators. Here is where your project starts.







        share|cite|improve this answer












        share|cite|improve this answer



        share|cite|improve this answer










        answered Jan 23 at 13:57









        PedroPedro

        10.7k23374




        10.7k23374






























            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%2f3083483%2foperator-semigroups-simplified%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

            MongoDB - Not Authorized To Execute Command

            in spring boot 2.1 many test slices are not allowed anymore due to multiple @BootstrapWith

            How to fix TextFormField cause rebuild widget in Flutter