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A 5-minute video by Alan Macdonald about algebra and geometry, on the Mathematics shelf. It came up in 2 Reddit threads, in r/3Blue1Brown and r/math.
Alan Macdonald, Video, 5 min, 2015, on the Mathematics shelf
44 min
A Swift Introduction to Geometric AlgebrasudgylacmoeMentioned in r/3Blue1Brown
45 min
Why There's 'No' Quintic Formula (proof without Galois theory)not all wrongMentioned in r/math
13 min
Intro to differential forms (part 1)David MetzlerMentioned in r/3Blue1Brown
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The Continuity of SplinesFreya HolmérMentioned in r/math
14 min
Dot products and duality | Chapter 9, Essence of linear algebra3Blue1BrownMentioned in r/3Blue1Brown
16 min
Visualize Spectral Decomposition | SEE Matrix, Chapter 2Visual KernelPosted to r/math
15 min
A Strangely Deep Problem about SequencesThatMathThingMentioned in r/math
18 min
What is the relation between the radii of these circles?Michael PennMentioned in r/math