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The chiral ring of the Coulomb branch of a 4D $N=2$ supersymmetric gauge theory is given by the Casimirs of the vector multiplet scalars, and they don't have non-trivial relations; the Casimirs are always independent.

Also in Gaiotto's class of $N=2$ non-Lagrangian theories, the chiral ring of the Coulomb branch doesn't (seem to) have relations.

Is it a general fact? If so, how can we deduce it from the $N=2$ supersymmetric algebras?

I was asked to clarify the definition of the Coulomb branch in non-Lagrangian theories; let's define them for $N=2$ SCFT by the fact that $SU(2)_R$ symmetry acts on the Coulomb branch operators trivially.

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Apologies for this possibly diversionary comment - can you recommend some reference starting point (hopefully pedagogical!) for this topic for beginning students? I have seen some papers and had worked on a project involving the calculation of the chiral ring but could never get my hands on a very clear exposition of the topic - it was quite hazy to pick it up from cutting edge papers! – user6818 Dec 10 '11 at 20:21
Which topic are you referring to? Chiral rings? This paper contains a nice review. In general, read and understand all papers by Seiberg or by Witten. Problem solved. – Yuji Dec 11 '11 at 6:52
Thanks a lot for the reference. "All papers" by Seiberg and Witten is almost sounding like an hyperbole :) Can you give a more practical advice - like from which papers to start for getting a grasp of the background of what you are asking here? And what kind of pre-requisites would be required? And how much time should it take - like how fast should one be able to work through any typical paper that you have in mind? I really don't understand how to read these papers! Should I read them like I try to read the volumes by Weinberg - line by line working out every line? – user6818 Dec 11 '11 at 22:37
There's a reason why textbooks and papers are called differently:) I say, you should just try reading a paper which interests you most, using various references. If you can, then you're ready; if you can't, then you're not. – Yuji Dec 15 '11 at 10:46
Thanks for the comments. I am not sure how to go about learning everything "done in the last century" - that sounds scary! But may be I can try reading Terning - though that is a very terse book! – user6818 Dec 20 '11 at 21:41

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