I'm not very good with analysis (I never studied it) but because of my "work" on other topics of mathematics I came to this problem. lim_(k->+oo) log_k(k^a+k^b)=max(a,b) I'm sure that this is really "reasonable" because I tryed to graph it for really huge values of k ... but "reasonable" is not enough in mathematics: I'd like to prve this. So I'm courious to know how one should go to prove it in a formal way ... if it is true (I hope). PS: I know nothing about Limits and their rules
PoentWeptgj
Answered question
2022-07-14
What is the limit of for ? I'm not very good with analysis (I never studied it) but because of my "work" on other topics of mathematics I came to this problem.
I'm sure that this is really "reasonable" because I tryed to graph it for really huge values of ... but "reasonable" is not enough in mathematics: I'd like to prve this. So I'm courious to know how one should go to prove it in a formal way ... if it is true (I hope). PS: I know nothing about Limits and their rules
Answer & Explanation
juicilysv
Beginner2022-07-15Added 17 answers
Use the functional equation:
When the log term goes to 0, if it goes to and
Lexi Mcneil
Beginner2022-07-16Added 2 answers
Without loss if generality assume then:
where I changed the base of the logarithm to get the second equality. Notice that if then and both as tends to . If then but as . Thus, the above tends to