Foundations: supplemental examples on proof or disproof of injectivity or surjectivity, 3-29-25

From a channel Lumen includes in full: James Cook, a university maths professor, posts his complete class lectures in calculus, linear algebra, differential equations and complex analysis.

A 18-minute video from James Cook Math's catalogue; the title names its topic.

Video by James Cook Math, played through YouTube's embedded player.