Prove 3 by 3 determinant Krattenthaler's Identity Donate to Channel(斗內一下): https://paypal.me/kuoenjui Facebook: https://www.facebook.com/mathenjui Instagram: https://www.instagram.com/mathphyen/ Please subscribe to my channel ... https://www.youtube.com/watch?v=wWfyuyLCT-A

Bertrand's postulate Proof In this video, I prove Bertrand's postulate step by step We need four lemmas Donate to Channel(斗內一下): https://paypal.me/kuoenjui Facebook: https://www.facebook.com/mathenjui Instagram: https://www.instagram.com/mathphyen/ Please subscribe to my channel Mathematical analysis https://www.youtube.com/playlist?list=PLg9w7tItBlZu-yFYxQrWrFKcdOHRz2Fkh group theory lecture https://www.youtube.com/playlist?list=PLg9w7tItBlZtSHrTTVjEzAsUcO69YXY7v Analytic number theory: https://www.youtube.com/playlist?list=PLg9w7tItBlZu2IdPFQkrvAsPs-V2B_dxk Real analysis: https://www.youtube.com/playlist?list=PLg9w7tItBlZsaSW0zlQ7m0S3Ti51bYJg_ Group representation for finite group https://www.youtube.com/playlist?list=PLg9w7tItBlZvxk4eus_gi2Wp3yYAEXF9- exact sequences https://www.youtube.com/playlist?list=PLg9w7tItBlZuI7n7notRRA2jol69e9mc9 Ring theory lecture https://www.youtube.com/playlist?list=PLg9w7tItBlZtfPKHWGlU55kqafEgUu45u Category theory https://www.youtube.com/playlist?app=desktop&list=PLg9w7tItBlZtI1njDjtXt_0Hkqbn9RVvi Field theory in abstract algebra https://www.youtube.com/playlist?list=PLg9w7tItBlZtA6XhMIgIPkgj_SDKChbN- ... https://www.youtube.com/watch?v=9z_tEuRSeow

introduction to Fourier series and prove Riemann Lebesgue lemma Subscribe to my channel In this video, I give a short introduction to the Fourier series and prove Riemann Lebesgue lemma 0:00 start 4:44 define the orthogonal and orthonormal basis 9:00 prove the Riemann Lebesgue lemma Advanced mathematics list: Group representation for finite group https://www.youtube.com/playlist?list=PLg9w7tItBlZvxk4eus_gi2Wp3yYAEXF9- exact sequences https://www.youtube.com/playlist?list=PLg9w7tItBlZuI7n7notRRA2jol69e9mc9 Ring theory lecture https://www.youtube.com/playlist?list=PLg9w7tItBlZtfPKHWGlU55kqafEgUu45u group theory lecture https://www.youtube.com/playlist?list=PLg9w7tItBlZtSHrTTVjEzAsUcO69YXY7v Category theory https://www.youtube.com/playlist?app=desktop&list=PLg9w7tItBlZtI1njDjtXt_0Hkqbn9RVvi Field theory in abstract algebra https://www.youtube.com/playlist?list=PLg9w7tItBlZtA6XhMIgIPkgj_SDKChbN- Mathematical analysis https://www.youtube.com/playlist?list=PLg9w7tItBlZu-yFYxQrWrFKcdOHRz2Fkh Please subscribe to my channel if you like it ... https://www.youtube.com/watch?v=2OcaFC8Xwp4

Leetcode 1122 Relative Sort Array ############## My other Leetcode solving videos (easy) https://www.youtube.com/playlist?list=PLg9w7tItBlZt4oUpNyWU_0rOItlScu1_d Leetcode solving videos (Medium): https://www.youtube.com/playlist?list=PLg9w7tItBlZvMGxy-y1eXURPD6Ao6kkzA Leetcode solving videos (Hard): https://www.youtube.com/playlist?list=PLg9w7tItBlZt4JQmlkGD3M5idZn14NyL6 ############ ... https://www.youtube.com/watch?v=nvL827WxEd4