There is also Naive Lie Theory by Stillwell, which is targeted at an undergraduate level. I haven't read it yet, but it's been on my radar for a while. https:/

There is also Naive Lie Theory by Stillwell, which is targeted at an undergraduate level. I haven't read it yet, but it's been on my radar for a while. https://www.amazon.com/Naive-Theory-Undergraduate-Texts-Mathematics/dp/0387782141 https://www.amazon.com/Naive-Theory-Undergraduate-Texts-Math...