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 Jan16 awarded Popular Question Dec25 revised Find the matrix for T with respect to the standard bases. edited body Oct20 revised How is it sometimes helpful to use cross multiplication in order to complete proportions with a variable? edited tags Oct20 comment How is it sometimes helpful to use cross multiplication in order to complete proportions with a variable? It's hard to tell what you're asking. Are you asking for a proof or explanation as to why this works? Or are you asking why it's necessary to check your solution afterwards? Sep30 awarded Explainer Sep24 awarded Autobiographer Jul31 awarded Popular Question Jul25 comment Parametrization Question It's hard to tell what your confusion is. For a line integral, you're integrating with respect to the curve. You only parameterize a curve with a single variable, so you wouldn't use $dx dy$. Jul15 awarded Yearling Jul2 awarded Curious Jun28 revised What is the summation notation for the Fibonacci numbers? username change Jun28 comment What is the summation notation for the Fibonacci numbers? @DantheMan Because it's just taking two numbers and adding them together. It's basically just the definition of the Fibonacci sequence. Jun28 accepted Does anyone know why this inclusion exclusion calculation isn't working? Jun28 comment Does anyone know why this inclusion exclusion calculation isn't working? @askyle Whoops, sorry. Didn't realize I hadn't accepted an answer yet. Jun21 revised What is your intuitive understanding of infinity? edited tags Jun11 comment How to Calculate the 2 balance points “Swinging Sticks” physics toy/desk sculpture?? Related: math.stackexchange.com/questions/274663/…. And here I thought I was the only one who found this mathematically interesting :) Jun10 answered Simultaneous equations Jun10 comment Evaluate integral @Tunk-Fey That's probably not the asker's issue, since he/she is getting 0 as a result. May16 reviewed Approve Find the value of $(a,b)$ Mar27 accepted Why is the supremum of the empty set $-\infty$ and the infimum $\infty$?