What topic is this? Any advice on where to go to understand these types of questions?

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Sorry if this is not how I'm supposed to use this site but it's my only sense of direction.



I want to know what topics these are and if there are any videos or articles that would help understand how to solve them. My lecture note's aren't great?



Cheers.



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real-analysis




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  • Hint: If $b=10$ then each term of the series is a decimal term in the expansion of $x$.
    – adfriedman
    Jul 30 at 18:36







  • 1




    What exactly is the "this" in your "What topic is this?"? Do you just mean the general lore of summations? Or is there something about these specific summations that piques your interest?
    – Blue
    Jul 30 at 19:41










  • @Blue "this" as in "sequences,recursion" what topic isit when series converge with a sum in a certain range?
    – K.M.
    Jul 31 at 13:52














up vote
1
down vote

favorite












Sorry if this is not how I'm supposed to use this site but it's my only sense of direction.



I want to know what topics these are and if there are any videos or articles that would help understand how to solve them. My lecture note's aren't great?



Cheers.



enter image description here




real-analysis




share|cite|improve this question



















  • Hint: If $b=10$ then each term of the series is a decimal term in the expansion of $x$.
    – adfriedman
    Jul 30 at 18:36







  • 1




    What exactly is the "this" in your "What topic is this?"? Do you just mean the general lore of summations? Or is there something about these specific summations that piques your interest?
    – Blue
    Jul 30 at 19:41










  • @Blue "this" as in "sequences,recursion" what topic isit when series converge with a sum in a certain range?
    – K.M.
    Jul 31 at 13:52












up vote
1
down vote

favorite









up vote
1
down vote

favorite











Sorry if this is not how I'm supposed to use this site but it's my only sense of direction.



I want to know what topics these are and if there are any videos or articles that would help understand how to solve them. My lecture note's aren't great?



Cheers.



enter image description here




real-analysis




share|cite|improve this question











Sorry if this is not how I'm supposed to use this site but it's my only sense of direction.



I want to know what topics these are and if there are any videos or articles that would help understand how to solve them. My lecture note's aren't great?



Cheers.



enter image description here





real-analysis





share|cite|improve this question










share|cite|improve this question




share|cite|improve this question









asked Jul 30 at 18:21









K.M.

17711




17711











  • Hint: If $b=10$ then each term of the series is a decimal term in the expansion of $x$.
    – adfriedman
    Jul 30 at 18:36







  • 1




    What exactly is the "this" in your "What topic is this?"? Do you just mean the general lore of summations? Or is there something about these specific summations that piques your interest?
    – Blue
    Jul 30 at 19:41










  • @Blue "this" as in "sequences,recursion" what topic isit when series converge with a sum in a certain range?
    – K.M.
    Jul 31 at 13:52
















  • Hint: If $b=10$ then each term of the series is a decimal term in the expansion of $x$.
    – adfriedman
    Jul 30 at 18:36







  • 1




    What exactly is the "this" in your "What topic is this?"? Do you just mean the general lore of summations? Or is there something about these specific summations that piques your interest?
    – Blue
    Jul 30 at 19:41










  • @Blue "this" as in "sequences,recursion" what topic isit when series converge with a sum in a certain range?
    – K.M.
    Jul 31 at 13:52















Hint: If $b=10$ then each term of the series is a decimal term in the expansion of $x$.
– adfriedman
Jul 30 at 18:36





Hint: If $b=10$ then each term of the series is a decimal term in the expansion of $x$.
– adfriedman
Jul 30 at 18:36





1




1




What exactly is the "this" in your "What topic is this?"? Do you just mean the general lore of summations? Or is there something about these specific summations that piques your interest?
– Blue
Jul 30 at 19:41




What exactly is the "this" in your "What topic is this?"? Do you just mean the general lore of summations? Or is there something about these specific summations that piques your interest?
– Blue
Jul 30 at 19:41












@Blue "this" as in "sequences,recursion" what topic isit when series converge with a sum in a certain range?
– K.M.
Jul 31 at 13:52




@Blue "this" as in "sequences,recursion" what topic isit when series converge with a sum in a certain range?
– K.M.
Jul 31 at 13:52















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