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Riemann integral/1 over x/No lower and no upper integral/Exercise
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Prove that for the function
]
0
,
1
]
⟶
R
,
x
⟼
1
x
,
{\displaystyle ]0,1]\longrightarrow \mathbb {R} ,x\longmapsto {\frac {1}{x}},}
neither the lower nor the upper integral exist.
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