First off, i would like to start by saying how much i appreciate the time and effort you have put in to making the math videos and the accessibility of the website. You were able to break down the concepts and teach calculus in such a simple manner it was very helpful and easy to retain. My actual teacher on the other hand wasn't even close. He knew the material well but wasn't able to teach the class, and sort of just did problems without explaining anything. We didn't even have a book for the class or any homework to turn in, everything was online! It was very frustrating, and if i wasn't able to watch your math videos online i can honestly say there is no way i could have ever learned most of the material in the course! The videos were taught so unbelievably well, switching colors in pens and explaining every concept and almost every step... YOU MADE CALCULUS EASY AND FUN!!! (well pretty easy). haha but i am a sophomore this year and out of every professor i've had at sdsu so far, you are by far the best, and my favorite! and it's sad to say i wasn't even enrolled in your class. Well have a great holiday Mr. Alvarez, thanks again for everything. YOU ARE THE BEST TEACHER EVER!