sup(A+B) = sup(A) + sup(B)
In this video, I use the definition of sup to show that sup(A+B) = sup(A) + sup(B). It's a sup-er awesome identity!
Check out my Real Numbers Playlist: https://www.youtube.com/playlist?list=PLJb1qAQIrmmCZggpJZvUXnUzaw7fHCtoh