Recent content by demon

Monkeys and humans share a common ancestor. That's it.

I recommend Inkscape. It takes some time to learn all its features (among other things because there are many), but it's very powerful. And it's free, open source and multi-platform!

Hi Ray, Sorry, I didn't realize. In any case I assumed that the OP is working with real numbers.

Hi Ray. Sorry, the function is perfectly defined for x<0, just notice that the exponents are 1/5 and 3/5, with the numerator being odd. For example, $$(-3125)^{(3/5)} = -125$$

Both methods you propose are too messy for my liking, and they don't show the reasoning behind the calculations. Show structure and order in your solutions, and offer the lecturer(?) a line of reasoning. For example: We will consider that the diode is ideal, e.g. RD=0. Because of the drop...

You're right, you don't know the resistance of the diode. But let's consider what the problem statement says: the potential across the diode is 0.6V when conducting. This is regardless of the current across it. Hence, we cannot consider that Ohm's law, V=RI, is applicable to the diode, as the...

Please forget this last point, I got confused with δ and ∂ again...

Samalkhaiat, Thank you very much for both explanations! Best regards

Hi samalkhaiat, thank you very much for your contribution. I fail to follow you on the derivation of: ∇λ(δgμν)=δ(∇λgμν)+gρν δΓρμλ+gμρ δΓρλν I'd be very grateful if you could show the intermediate steps. I made a mistake asserting the the covariant derivative and the variation commute. This...

Oh, I just saw it, right in front of my nose... :) Thank you!

I often recycle HDPE for mechanical parts: https://en.wikipedia.org/wiki/High-density_polyethylene My main source of HDPE are milk bottles. I shred them using an old blender, then heat them up in the oven at 230-250°C until they are soft. No obnoxious gasses are emitted, but make sure you...

Uh, another feature I haven't come across. Could you let me know where to find it? just in case it is another "bonus" feature...

Well, thanks to all for your help. I have tried the watch thread option, but I always get the message "You do not have any watched threads that are unread." This is normally the case for the threads I'm interested so far, because they are generally old threads and nobody is contributing to them...

Thank you!

No, actually I'm on my PC (Firefox - Ubuntu). I can see the "Report" option, but not the bookmark. Can't figure out why. But at least now I know that the functionality exists, and the button should be there. I'll try with another browser, or in a different PC and see what I get. Thank you very...