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 Jan16 awarded Popular Question Jan15 awarded Notable Question Dec19 awarded Caucus Jul7 awarded Popular Question Jul3 awarded Popular Question Jul2 awarded Curious Apr5 awarded Supporter Feb1 awarded Autobiographer Sep27 awarded Popular Question Sep10 awarded Yearling May14 awarded Caucus Dec14 reviewed Approve How to demonstrate if H is a subspace? Dec14 comment How to demonstrate if H is a subspace? Yes, I think I can do that but I only have one vector, whats is the other vector $v$ ? Dec14 asked How to demonstrate if H is a subspace? Sep21 awarded Custodian Jun26 accepted Understanding Riemann sums Jun26 comment Understanding Riemann sums Shouldn't be each points $iΔx$ for the right point and $(i-1)Δx$ for the left one instead $\frac{i}{n}$ ? I don't understand that :/ By the way very nice explanation :) Jun26 comment Understanding Riemann sums Thank you :) I understand what you are saying. But my $f(x) = \sqrt{x}$ That's why I don't understand why it is $\frac{i^2}{n^2}$ unless my book had an error. I understand that Riemann is: $$\sum_{i=1}^n f(C_i)Δx$$ But the divisions in n intervals of the funtion are not neccessarily equal. Jun26 comment Understanding Riemann sums $C_i$ is each point on the x axis. $C_i(right)$ is the right point of a rectangle and $C_i(left)$ is the left point Jun26 awarded Editor