Yep, love this guy. His notes helped me through my calculus finals in high school eight years ago and then through college as well. If you notice an error be s

Yep, love this guy. His notes helped me through my calculus finals in high school eight years ago and then through college as well. If you notice an error be sure to correct it though. I did once while studying for my high school finals while staying up to 3AM. He responded quickly and fixed it immediately. Great to see someone who pays attention. Just checked my email account. Apparently, I've emailed him corrections three times over the period of 4 years. He always emailed back within 24 hours.