AoPS: https://artofproblemsolving.com/

Integration Bee at MIT: www.mit.edu/~pax/integrationbee.html

3Blue1Brown: https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw

Wolfram Alpha: https://www.wolframalpha.com/

Desmos: https://www.desmos.com/

Turing Machines & Computability by Dr. Ed Green, PSU

What “The mean of the mean is the mean" means by Dr. David Hunter, PSU

Cool Results Involving Fibonacci Numbers and Compositions by Dr. James Sellers, PSU

Mathematical Induction by Dr. Sergei Tabachnikov, PSU

Fibonacci! by Dr. James Sellers, PSU

Matching with e's! by Dr. David Hunter, PSU

p-adic Numbers by Dr. Nigel Higson, PSU

Codes and Encryption by Dr. Kirsten Eisentraeger, PSU

Graph Theory by Dr. Misha Guysinski, PSU Pdf 2 from this talk

Pigeonhole Principle by Dr. Sergei Tabachnikov, PSU

Meet the Cube by Dr. Sergei Tabachnikov, PSU

Chebyshev Polynomials by Dr. Sergei Tabachnikov, PSU Pdf2 from this talk

Polynomials and Symmetry by Dr. Nigel Higson, PSU

Curvature of Space by Dr. John Roe, PSU

Linear Equations and "Lights Out" by Dr. Misha Guysinski, PSU

The Mathematical Mechanic by Dr. Mark Levi, PSU

From Complex Numbers to Quaternions, and Beyond by Dr. Sergei Tabachnikov, PSU

The Mathematics of Rock Climbing by Dr. John Roe, PSU

Counting infinite sets by Dr. Misha Guysinski, PSU

Selected Problems by Dr. Sergei Tabachnikov, PSU

Challenging Problems for Fun by Dr. Mark Levi, PSU

Combinatorics by Dr. Sergei Tabachnikov, PSU

Parity Dr. Sergei Tabachnikov, PSU

https://sites.google.com/a/scasd.org/state-college-math-circle/home