# Recent content by Bobman

1. ### Determine a basis for kernel/nullspace

Great, thanks. That's very true, i think i tried to make it overly clear with the "order" by keeping the parameters. Thanks for clarifying!
2. ### Determine a basis for kernel/nullspace

Homework Statement [/B] A=##\begin{bmatrix} 1 & 2 & 3 \\ 4 & 8 & 12 \end{bmatrix}## Question: Determine a basis for ker(A). Homework Equations Ker(A)=##\begin{bmatrix} 1 & 2 & 3& |&0 \\ 4 & 8 & 12& |&0 \end{bmatrix}## (And reduce with gaussian elimination) The Attempt at a Solution (Sorry...
3. ### Calculus Recommendation of a thorough book on suffix/index notation?

Good idea, i'll check it out. So i may have been a bit harsh in the heat of the moment, but i would stand by that they contain about 10% of the information. I want to try to avoid to cherrypick, but in addition to most of the pages that fresh_42 linked, there are a lot of examples that i...
4. ### Calculus Recommendation of a thorough book on suffix/index notation?

Indeed, and the swedish ones (it's my native language) are utterly rubbish and almost as a rule contains only 10% of the information. That's why i feel it's a shame if there aren't any textbooks on the matter. It is probably possible to just put yourself through it all by trial and error, but...
5. ### Calculus Recommendation of a thorough book on suffix/index notation?

Ah, sorry for misunderstanding you. I did give wiki a good look when i actually took the course, but i remember not thinking it being very helpful for me. But perhaps its worth revisiting then, still hoping for a book that would cover it though :)
6. ### Calculus Recommendation of a thorough book on suffix/index notation?

I think we might be talking about different things, I probably made a weak point. I meant a book on the actual skill on manipulating expressions "using" the notation. And for two examples on what i am actually talking about i added two pictures below from my professors slide...
7. ### Calculus Recommendation of a thorough book on suffix/index notation?

I believe it is also called "einstein notation"? The "notation-thingy" using kronecker delta, levi-civita and etc to simplify expressions with div, grad, curl (i took the course in my native language so i am not entirely sure what the notation or technique is called in english). Looking to get...
8. ### Best style of martial arts for self-defense?

I've practiced different martial arts basically my whole life, mostly traditional martial arts (i.e. not martial arts where you intended to compete or view it as a sport) and thus not the most practical for actual self defense. I've mainly done it because i enjoy it. Strictly speaking for self...
9. ### Courses Multiple physics and maths courses at the same time?

One thing i didn't add, is that during november-january i will only have one math based course, "Continuous time signals and systems" along with two "easy" non-math based courses. This will hopefully give me time to prepare for this more "strenuous" semester. I dont have to worry about work, i...
10. ### Online Tutoring

To be fair, while your point is valid, he did not state what subject he would tutor in.
11. ### Studying Are there any good exercise books for Quantum Mechanics?

Not a actual book recommendation, but you could also rework some old exams from your course and similar courses if you haven't done that already. Given that your university publish all old exams for students to download that is.
12. ### Studying Are there any good exercise books for Quantum Mechanics?

Have you looked at Schaums outline? I haven't taken QM yet so i cannot comment on it by actual experience, but i usually find the vast number of solved problems in schaums very helpful in other courses. They are also quite cheap. You could check the content here and see if it fits...
13. ### Courses Multiple physics and maths courses at the same time?

So we are to choose electives (this is all undergrad) for the spring in about a month or so, and i am having doubts if i might end up taking one "math heavy" or "concept heavy" course too many. My uni splits one semester into two periods, meaning the spring semester is based on two periods...
14. ### What sparked your interest for physics?

For me it was something as trivial as a conceptual example of newtons third law, the astronaut creating momentum by tossing a wrench, that gave me an eyeopener for the subject. What ignited your spark?
15. ### Can anyone learn advanced maths? (Researches)

Answering this side note, i am similar to your niece. I enjoyed calculus (at least multivariable, vector and tensor) and linear algebra, but i absolutely loathe programming. I cannot make sense of it and it is the first subject i have come across that i actually cannot bring myself to want to...