Arbitrary constants of 2nd order linear ODE with negative discriminant are complex conjugates?











up vote
0
down vote

favorite












I'm in a mathematical modeling course. My professor was showing us how to solve initial value problems regarding 2nd order linear ODEs with a negative discriminant. He asserted that the arbitrary constants of such a solution must be complex conjugates. A link to his notes can be found here: https://drive.google.com/file/d/15-JEfxYYAzie-DKKZ2LXJBhK3QBR0dUe/view?usp=sharing
Skip to page 9. He makes the assertion on page 11.



Can anyone produce a proof of this fact? He threw it straight out of the blue in the lecture.










share|cite|improve this question






















  • Something like this answer? Where exactly do your problems start?
    – LutzL
    Nov 17 at 14:59










  • I didn't spot this when I posted the question. Thank you so much!
    – K.defaoite
    Nov 18 at 12:01















up vote
0
down vote

favorite












I'm in a mathematical modeling course. My professor was showing us how to solve initial value problems regarding 2nd order linear ODEs with a negative discriminant. He asserted that the arbitrary constants of such a solution must be complex conjugates. A link to his notes can be found here: https://drive.google.com/file/d/15-JEfxYYAzie-DKKZ2LXJBhK3QBR0dUe/view?usp=sharing
Skip to page 9. He makes the assertion on page 11.



Can anyone produce a proof of this fact? He threw it straight out of the blue in the lecture.










share|cite|improve this question






















  • Something like this answer? Where exactly do your problems start?
    – LutzL
    Nov 17 at 14:59










  • I didn't spot this when I posted the question. Thank you so much!
    – K.defaoite
    Nov 18 at 12:01













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I'm in a mathematical modeling course. My professor was showing us how to solve initial value problems regarding 2nd order linear ODEs with a negative discriminant. He asserted that the arbitrary constants of such a solution must be complex conjugates. A link to his notes can be found here: https://drive.google.com/file/d/15-JEfxYYAzie-DKKZ2LXJBhK3QBR0dUe/view?usp=sharing
Skip to page 9. He makes the assertion on page 11.



Can anyone produce a proof of this fact? He threw it straight out of the blue in the lecture.










share|cite|improve this question













I'm in a mathematical modeling course. My professor was showing us how to solve initial value problems regarding 2nd order linear ODEs with a negative discriminant. He asserted that the arbitrary constants of such a solution must be complex conjugates. A link to his notes can be found here: https://drive.google.com/file/d/15-JEfxYYAzie-DKKZ2LXJBhK3QBR0dUe/view?usp=sharing
Skip to page 9. He makes the assertion on page 11.



Can anyone produce a proof of this fact? He threw it straight out of the blue in the lecture.







differential-equations complex-numbers






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Nov 17 at 14:16









K.defaoite

11




11












  • Something like this answer? Where exactly do your problems start?
    – LutzL
    Nov 17 at 14:59










  • I didn't spot this when I posted the question. Thank you so much!
    – K.defaoite
    Nov 18 at 12:01


















  • Something like this answer? Where exactly do your problems start?
    – LutzL
    Nov 17 at 14:59










  • I didn't spot this when I posted the question. Thank you so much!
    – K.defaoite
    Nov 18 at 12:01
















Something like this answer? Where exactly do your problems start?
– LutzL
Nov 17 at 14:59




Something like this answer? Where exactly do your problems start?
– LutzL
Nov 17 at 14:59












I didn't spot this when I posted the question. Thank you so much!
– K.defaoite
Nov 18 at 12:01




I didn't spot this when I posted the question. Thank you so much!
– K.defaoite
Nov 18 at 12:01















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%2f3002404%2farbitrary-constants-of-2nd-order-linear-ode-with-negative-discriminant-are-compl%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




















































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%2f3002404%2farbitrary-constants-of-2nd-order-linear-ode-with-negative-discriminant-are-compl%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

AnyDesk - Fatal Program Failure

How to calibrate 16:9 built-in touch-screen to a 4:3 resolution?

QoS: MAC-Priority for clients behind a repeater