$B in mathcal{B}(M) Leftrightarrow (rB+x) in mathcal{B}(N)$












0














Let $M$ be a $d$-dimensional manifold in $mathbb{R}^p$ and let $r>0, x in mathbb{R}^p$. Then $N:=rM+x$ is also a $d$-dimensional manifold in $mathbb{R^p}$.



I want to show that for $B subseteq M mathcal{}\B in mathcal{B}(M) Leftrightarrow (rB+x) in mathcal{B}(N)$



where $mathcal{B}$ is the Borel $sigma$ algebra.



How can I show this? I thought about using the fast that $T(B)=rB+x$ is a homeomorphism somehow but I don't know if that works










share|cite|improve this question



























    0














    Let $M$ be a $d$-dimensional manifold in $mathbb{R}^p$ and let $r>0, x in mathbb{R}^p$. Then $N:=rM+x$ is also a $d$-dimensional manifold in $mathbb{R^p}$.



    I want to show that for $B subseteq M mathcal{}\B in mathcal{B}(M) Leftrightarrow (rB+x) in mathcal{B}(N)$



    where $mathcal{B}$ is the Borel $sigma$ algebra.



    How can I show this? I thought about using the fast that $T(B)=rB+x$ is a homeomorphism somehow but I don't know if that works










    share|cite|improve this question

























      0












      0








      0







      Let $M$ be a $d$-dimensional manifold in $mathbb{R}^p$ and let $r>0, x in mathbb{R}^p$. Then $N:=rM+x$ is also a $d$-dimensional manifold in $mathbb{R^p}$.



      I want to show that for $B subseteq M mathcal{}\B in mathcal{B}(M) Leftrightarrow (rB+x) in mathcal{B}(N)$



      where $mathcal{B}$ is the Borel $sigma$ algebra.



      How can I show this? I thought about using the fast that $T(B)=rB+x$ is a homeomorphism somehow but I don't know if that works










      share|cite|improve this question













      Let $M$ be a $d$-dimensional manifold in $mathbb{R}^p$ and let $r>0, x in mathbb{R}^p$. Then $N:=rM+x$ is also a $d$-dimensional manifold in $mathbb{R^p}$.



      I want to show that for $B subseteq M mathcal{}\B in mathcal{B}(M) Leftrightarrow (rB+x) in mathcal{B}(N)$



      where $mathcal{B}$ is the Borel $sigma$ algebra.



      How can I show this? I thought about using the fast that $T(B)=rB+x$ is a homeomorphism somehow but I don't know if that works







      real-analysis analysis measure-theory






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked Dec 2 at 11:32









      conrad

      757




      757






















          1 Answer
          1






          active

          oldest

          votes


















          0














          Any homeomorphism $T$ between topological spaces $X$ and $Y$ preserves Borel sets in the sense $B$ is Borel in $X$ iff $T(X)$ is Borel in $Y$. This is easy to see from the definition of Borel sigma algebra as the one generated by open sets. In this case $Ty=ry+x$ defines a homeomorphism.






          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%2f3022523%2fb-in-mathcalbm-leftrightarrow-rbx-in-mathcalbn%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









            0














            Any homeomorphism $T$ between topological spaces $X$ and $Y$ preserves Borel sets in the sense $B$ is Borel in $X$ iff $T(X)$ is Borel in $Y$. This is easy to see from the definition of Borel sigma algebra as the one generated by open sets. In this case $Ty=ry+x$ defines a homeomorphism.






            share|cite|improve this answer


























              0














              Any homeomorphism $T$ between topological spaces $X$ and $Y$ preserves Borel sets in the sense $B$ is Borel in $X$ iff $T(X)$ is Borel in $Y$. This is easy to see from the definition of Borel sigma algebra as the one generated by open sets. In this case $Ty=ry+x$ defines a homeomorphism.






              share|cite|improve this answer
























                0












                0








                0






                Any homeomorphism $T$ between topological spaces $X$ and $Y$ preserves Borel sets in the sense $B$ is Borel in $X$ iff $T(X)$ is Borel in $Y$. This is easy to see from the definition of Borel sigma algebra as the one generated by open sets. In this case $Ty=ry+x$ defines a homeomorphism.






                share|cite|improve this answer












                Any homeomorphism $T$ between topological spaces $X$ and $Y$ preserves Borel sets in the sense $B$ is Borel in $X$ iff $T(X)$ is Borel in $Y$. This is easy to see from the definition of Borel sigma algebra as the one generated by open sets. In this case $Ty=ry+x$ defines a homeomorphism.







                share|cite|improve this answer












                share|cite|improve this answer



                share|cite|improve this answer










                answered Dec 2 at 11:40









                Kavi Rama Murthy

                49.9k31854




                49.9k31854






























                    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%2f3022523%2fb-in-mathcalbm-leftrightarrow-rbx-in-mathcalbn%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...