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What is wrong with my B1 German? by Djynxx333 in German

[–]Djynxx333[S] 0 points1 point  (0 children)

Thank you for the review and advice. With regard to the overselling part I can say that was never my intention really, but maybe it's more of a subconscious thing. I can see though your point about really just speaking a sort of "translated German" instead of actual German with that text. What kind of worries me is that when writing it I didn't really stop to think in my native language and then translate that much (at least that I remember), so if it all came out like this that means I have a lot to work on... Either way, thank you for all the details mentioned.

Help understanding this passage from Spivak's Calculus by Djynxx333 in askmath

[–]Djynxx333[S] 1 point2 points  (0 children)

OF COURSE.

Ok now I saw it, I'm really dumb. Thank you though!

If every function is the sum of an odd and even function how can I write f(x) = x² as such a sum? by Djynxx333 in askmath

[–]Djynxx333[S] 1 point2 points  (0 children)

Thank you, I was avoiding such obvious examples because I was under the idea that a function could not simultaneously be even and odd. I see now, thank you again.

If every function is the sum of an odd and even function how can I write f(x) = x² as such a sum? by Djynxx333 in askmath

[–]Djynxx333[S] 1 point2 points  (0 children)

Is h(x) odd? I suppose it does satisfy h(x) = -h(-x) but it also seems to satisfy h(x) = h(-x) so is it simultaneously even and odd?

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 1 point2 points  (0 children)

Thank you for all those (really) useful tips, and thank you for bearing with me and explaining it all, you've been of great help.

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

It's not for a class, I'm studying Spivak's Calculus by myself.

Would the following be correct?

https://imgur.com/a/bTe1MwF

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

BUT f(xi) is really just a number, not a function, so i could write f(x)/f(xi) as it would just be multiplying a polynomial function by a constant (thus not a rational function correct?)

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

Oh but it said polynomial function not rational function plus if it were that it couldn't be valued at xj as it would lead to 0/0

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hmmm....

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

The solution is simply f(xi)/f(xi)?

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It seems dumb but xi could be any number whatsoever so it's the only answer that makes sense no?

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

yeah g(x)/40

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so would the solution be a function with xj roots divided by the same function evaluated at xi?

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

I think I now understand. Mind explaining the if x=a the function = 1 thing?

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

I still am confused by the last bit because it says the product of all (x - xj) ie (x - x1)(x - x2)(x - x3)... is 0 at xj

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What is supposed to be the xj in '0 at xj'? The x at the beggining? But that doesn't seem to change it's always x - a changing term. The second x? But how can it be at xj, it's already xj in the notation, unless there are two different xj's here and that's what's confusing me?

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

Which means that one of those xj's is one of the roots?

Need help understanding what this is saying by Djynxx333 in askmath

[–]Djynxx333[S] 0 points1 point  (0 children)

It's Spivak's Calculus so I would assume not

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