Recent content by Biker

Okay so, do you have specific way or a clear question I could show that to the professor and convince him ?

So it does not matter whether the balls are identical or not ?

Yes you don't need to choose the 3 containers, For example assume they are the first 3

So we had an exam question which was the following: Assume you have N identical balls and K different contains if there are N pre-Selected boxes and that N < k what is the probablity that none of these pre-selected boxes are empty? I answered it and it was the same as the professor's answer...

Pretty nice, Thank you Fresh.

Actually I might have proved it Assume: ##(1-P(D)) y = x^n ## Assume ##y = Q(D) x^n## If this ##Q(D) = (1+P(D) + P(D)^2 ... )## ##(1-P(D)) (1+P(D) + P(D)^2 ... ) x^n ## It is easy to verify that this is equal to x^n thus ##y = Q(D) x^n## We have the rules of D operator for Linearity, Sum and...

Thank you all for the responses. Sorry for the late reply. Fresh_42, That is kinda advanced mathematics for me. I still haven't taken most of what you have mentioned. RPinPA, Exactly. I understood the method of undetermined coefficients. Absolutely reasonable for me. I can also work with the D...

How does this relate to my question? "And they continue by expanding using maclaurin series. How do you treat an operator as a variable? How could you possibly assign a value of zero to it?"

I don't really understand how their inverses work. For example, in solving 2nd order linear non-homogeneous differential equations. The particular solution is found by ## y_{pi} = \frac{p(x)}{f(D)} ## And they continue by expanding using maclaurin series. How do you treat an operator as a...

Brilliant, That cleared things so much for me. Thank you Nugatory.

I have been thinking about what you both said. I would ask you please to check if this is correct. Assume lorentz factor is 2 Say Observer A knows he will unfortunately explode when his clock reads 5 secs and he is moving relative to observer B. When both of them were at the same point they...

I don't really understand how time dilation works in SR. I just know this that "Now" in one reference frame is not the same in another so for example when Observer A says his time is 10s then at the same moment he will say Observer B's time who is moving relative to him is 5s for example. The...

Yes I know that but I am asking how you can do that? Like what codition do you put in each situation then sum it up? In wikipedia they put some conditions on the current in 3 situation but I didnt understand how ?

In the wikipedia page and on every book they proof the transformation by equaling the the equivalent resistance between any pair of terminals while disconnecting the other node.https://en.wikipedia.org/wiki/Y-%CE%94_transform Why this should make the two circuits equal? How can we apply...

My bad, Say you have a alloy made of 40% A and 60% B and another alloy 30% A and 70% B, if you heat both to the same temperature where you would have two phases ( Solid and liquid), Using tie line, You will find that the liquid or solid phase has the same composition regardless of the general...