Monster Group (John Conway) - Numberphile
Group theory, abstraction, and the 196,883-dimensional monster
The Monster Group - John Conway
Monster Group (a little extra bit)
Life, Death and the Monster (John Conway) - Numberphile
Richard Borcherds: Monster Group, String Theory, Moonshine
Sporadic groups
Why Do Sporadic Groups Exist?
Sporadic Groups - Prof Richard Borcherds - The Archimedeans
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Monstrous moonshine
Ram Murty explaining the origins of Monstrous Moonshine
Atkinsons - Monster Group UK
The Monster Group and Dirac's Large Numbers
Does The Monster Group Imply the Existence of Other Universes?
THE MONSTER GROUP
Monster Group
Of Monsters and Men - Little Talks
Simple Groups - Abstract Algebra