Support the channel on Steady: https://steadyhq.com/en/brightsideofmaths Or support me via PayPal: https://paypal.me/brightmaths Or via Ko-fi: https://ko-fi.com/thebrightsideofmathematics Or via Patreon: https://www.patreon.com/bsom Or via other methods: https://thebrightsideofmathematics.com/support/ Watch the whole video series about Advent of Mathematical Symbols and download PDF versions and quizzes: https://tbsom.de/s/aoms There is also a dark mode version of this video: https://www.youtube.com/watch?v=puem_0keuoM. There is also a bright mode version of this video: https://www.youtube.com/watch?v=vEUnVm2k2-k. To find the YouTube-Playlist, click here for the bright version:    • Advent of Mathematical Symbols [brigh...   And click here for the dark version of the playlist:    • Advent of Mathematical Symbols [dark ...   Thanks to all supporters! They are mentioned in the credits of the video :) This is my video series about Advent of Mathematical Symbols. I hope that it will help everyone who wants to learn about it. #AdventofMathematicalSymbols #Analysis #Calculus #Mathematics This is #Day12 in the series. (This explanation fits to lectures for students in their first year of study: Mathematics for physicists, Mathematics for the natural science, Mathematics for engineers and so on)