Is it possible to call this operation as Direct sum?












1














Problem: Calculate $$((...((2018 oplus 2017) oplus2016)oplus...oplus2)oplus 1)$$ if $$ x oplus y = frac {3(x+9y)} {xy+81} $$.



I assume that it will be a multiple of 1009, but can't solve it.










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  • It has nothing to do with the direct sum, this is just "abuse" of the notation commonly used for the direct sum. And this is not really abstract algebra either.
    – Auclair
    Nov 27 '18 at 9:44










  • Thanks, I suspected it.
    – Vaca J.
    Nov 27 '18 at 12:28
















1














Problem: Calculate $$((...((2018 oplus 2017) oplus2016)oplus...oplus2)oplus 1)$$ if $$ x oplus y = frac {3(x+9y)} {xy+81} $$.



I assume that it will be a multiple of 1009, but can't solve it.










share|cite|improve this question






















  • It has nothing to do with the direct sum, this is just "abuse" of the notation commonly used for the direct sum. And this is not really abstract algebra either.
    – Auclair
    Nov 27 '18 at 9:44










  • Thanks, I suspected it.
    – Vaca J.
    Nov 27 '18 at 12:28














1












1








1


1





Problem: Calculate $$((...((2018 oplus 2017) oplus2016)oplus...oplus2)oplus 1)$$ if $$ x oplus y = frac {3(x+9y)} {xy+81} $$.



I assume that it will be a multiple of 1009, but can't solve it.










share|cite|improve this question













Problem: Calculate $$((...((2018 oplus 2017) oplus2016)oplus...oplus2)oplus 1)$$ if $$ x oplus y = frac {3(x+9y)} {xy+81} $$.



I assume that it will be a multiple of 1009, but can't solve it.







abstract-algebra






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share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Nov 27 '18 at 2:50









Vaca J.

61




61












  • It has nothing to do with the direct sum, this is just "abuse" of the notation commonly used for the direct sum. And this is not really abstract algebra either.
    – Auclair
    Nov 27 '18 at 9:44










  • Thanks, I suspected it.
    – Vaca J.
    Nov 27 '18 at 12:28


















  • It has nothing to do with the direct sum, this is just "abuse" of the notation commonly used for the direct sum. And this is not really abstract algebra either.
    – Auclair
    Nov 27 '18 at 9:44










  • Thanks, I suspected it.
    – Vaca J.
    Nov 27 '18 at 12:28
















It has nothing to do with the direct sum, this is just "abuse" of the notation commonly used for the direct sum. And this is not really abstract algebra either.
– Auclair
Nov 27 '18 at 9:44




It has nothing to do with the direct sum, this is just "abuse" of the notation commonly used for the direct sum. And this is not really abstract algebra either.
– Auclair
Nov 27 '18 at 9:44












Thanks, I suspected it.
– Vaca J.
Nov 27 '18 at 12:28




Thanks, I suspected it.
– Vaca J.
Nov 27 '18 at 12:28










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