let-f-be-the-function-defined-on-1-1-by-f-x-1-if-x-is-rational-1-if-x-is-irrational-find-U-P-f-and-L-P-f-f-is-integrable-or-not-

Question Number 25635 by rita1608 last updated on 12/Dec/17

l e t f b e t h e f u n c t i o n d e f i n e d o n

[- 1, 1] b y

f (x) = {{\begin{cases} - 1, i f x i s r a t i o n a l \\ 1, i f x i s i r r a t i o n a l . \end{cases}

f i n d U (P, f) a n d L (P, f) . f i s i n t e g r a b l e

o r n o t ?

Commented by rita1608 last updated on 12/Dec/17

p l s s s o l v e t h i s