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I took a class at university that involved group theory but I bombed it! (Ended up with a D) Mostly because I struggled to understand representation theory (especially irreps) in detail.

Im now taking a class in Lie algebras and Lie groups (at graduate level) next year but of course I want/need to gain a solid understanding of the basics! I tried hammermesh but I found it quite strange (the explanation he gives for representations is very odd I found!) and also Raymond which I found too advanced, given I was an undergrad at the time.

Many thanks!