How can I prove that a differentiable pseudoconvex function is also quasiconvex?












0












$begingroup$


How can I prove that a differentiable pseudoconvex function is also quasiconvex? Is it possible to do it simply using the definition of pseudoconvexity?
Thanks.










share|cite|improve this question









$endgroup$








  • 1




    $begingroup$
    What have you tried already? Where did you get stuck? Questions with no context and no signs of effort are often poorly received on this site, and may be closed for those reasons.
    $endgroup$
    – postmortes
    Jan 17 at 8:08










  • $begingroup$
    I apologize, I didn't want to break any of the site's rules, the problem is I don't know where to start actually. I tried using the definition of pseudoconvexity but I didn't get anywhere, then I tried to use the Taylor series of $f[(1-t)f(x)-tf(y)]$ trying to minimazing it using again the definition of pseudoconvexity but again nothing. I don't ask for a full execution, a hint for where to start or an idea of the proof is fine. Thank you.
    $endgroup$
    – Andrea
    Jan 17 at 8:31






  • 1




    $begingroup$
    Does this ( math.stackexchange.com/questions/2007482/… ) answer your question, by the way?
    $endgroup$
    – postmortes
    Jan 17 at 9:47
















0












$begingroup$


How can I prove that a differentiable pseudoconvex function is also quasiconvex? Is it possible to do it simply using the definition of pseudoconvexity?
Thanks.










share|cite|improve this question









$endgroup$








  • 1




    $begingroup$
    What have you tried already? Where did you get stuck? Questions with no context and no signs of effort are often poorly received on this site, and may be closed for those reasons.
    $endgroup$
    – postmortes
    Jan 17 at 8:08










  • $begingroup$
    I apologize, I didn't want to break any of the site's rules, the problem is I don't know where to start actually. I tried using the definition of pseudoconvexity but I didn't get anywhere, then I tried to use the Taylor series of $f[(1-t)f(x)-tf(y)]$ trying to minimazing it using again the definition of pseudoconvexity but again nothing. I don't ask for a full execution, a hint for where to start or an idea of the proof is fine. Thank you.
    $endgroup$
    – Andrea
    Jan 17 at 8:31






  • 1




    $begingroup$
    Does this ( math.stackexchange.com/questions/2007482/… ) answer your question, by the way?
    $endgroup$
    – postmortes
    Jan 17 at 9:47














0












0








0


1



$begingroup$


How can I prove that a differentiable pseudoconvex function is also quasiconvex? Is it possible to do it simply using the definition of pseudoconvexity?
Thanks.










share|cite|improve this question









$endgroup$




How can I prove that a differentiable pseudoconvex function is also quasiconvex? Is it possible to do it simply using the definition of pseudoconvexity?
Thanks.







convex-analysis






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Jan 17 at 0:42









AndreaAndrea

154




154








  • 1




    $begingroup$
    What have you tried already? Where did you get stuck? Questions with no context and no signs of effort are often poorly received on this site, and may be closed for those reasons.
    $endgroup$
    – postmortes
    Jan 17 at 8:08










  • $begingroup$
    I apologize, I didn't want to break any of the site's rules, the problem is I don't know where to start actually. I tried using the definition of pseudoconvexity but I didn't get anywhere, then I tried to use the Taylor series of $f[(1-t)f(x)-tf(y)]$ trying to minimazing it using again the definition of pseudoconvexity but again nothing. I don't ask for a full execution, a hint for where to start or an idea of the proof is fine. Thank you.
    $endgroup$
    – Andrea
    Jan 17 at 8:31






  • 1




    $begingroup$
    Does this ( math.stackexchange.com/questions/2007482/… ) answer your question, by the way?
    $endgroup$
    – postmortes
    Jan 17 at 9:47














  • 1




    $begingroup$
    What have you tried already? Where did you get stuck? Questions with no context and no signs of effort are often poorly received on this site, and may be closed for those reasons.
    $endgroup$
    – postmortes
    Jan 17 at 8:08










  • $begingroup$
    I apologize, I didn't want to break any of the site's rules, the problem is I don't know where to start actually. I tried using the definition of pseudoconvexity but I didn't get anywhere, then I tried to use the Taylor series of $f[(1-t)f(x)-tf(y)]$ trying to minimazing it using again the definition of pseudoconvexity but again nothing. I don't ask for a full execution, a hint for where to start or an idea of the proof is fine. Thank you.
    $endgroup$
    – Andrea
    Jan 17 at 8:31






  • 1




    $begingroup$
    Does this ( math.stackexchange.com/questions/2007482/… ) answer your question, by the way?
    $endgroup$
    – postmortes
    Jan 17 at 9:47








1




1




$begingroup$
What have you tried already? Where did you get stuck? Questions with no context and no signs of effort are often poorly received on this site, and may be closed for those reasons.
$endgroup$
– postmortes
Jan 17 at 8:08




$begingroup$
What have you tried already? Where did you get stuck? Questions with no context and no signs of effort are often poorly received on this site, and may be closed for those reasons.
$endgroup$
– postmortes
Jan 17 at 8:08












$begingroup$
I apologize, I didn't want to break any of the site's rules, the problem is I don't know where to start actually. I tried using the definition of pseudoconvexity but I didn't get anywhere, then I tried to use the Taylor series of $f[(1-t)f(x)-tf(y)]$ trying to minimazing it using again the definition of pseudoconvexity but again nothing. I don't ask for a full execution, a hint for where to start or an idea of the proof is fine. Thank you.
$endgroup$
– Andrea
Jan 17 at 8:31




$begingroup$
I apologize, I didn't want to break any of the site's rules, the problem is I don't know where to start actually. I tried using the definition of pseudoconvexity but I didn't get anywhere, then I tried to use the Taylor series of $f[(1-t)f(x)-tf(y)]$ trying to minimazing it using again the definition of pseudoconvexity but again nothing. I don't ask for a full execution, a hint for where to start or an idea of the proof is fine. Thank you.
$endgroup$
– Andrea
Jan 17 at 8:31




1




1




$begingroup$
Does this ( math.stackexchange.com/questions/2007482/… ) answer your question, by the way?
$endgroup$
– postmortes
Jan 17 at 9:47




$begingroup$
Does this ( math.stackexchange.com/questions/2007482/… ) answer your question, by the way?
$endgroup$
– postmortes
Jan 17 at 9:47










0






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',
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%2f3076474%2fhow-can-i-prove-that-a-differentiable-pseudoconvex-function-is-also-quasiconvex%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown

























0






active

oldest

votes








0






active

oldest

votes









active

oldest

votes






active

oldest

votes
















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%2f3076474%2fhow-can-i-prove-that-a-differentiable-pseudoconvex-function-is-also-quasiconvex%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

How to fix TextFormField cause rebuild widget in Flutter

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