These are the work of Marlon Tenório, who runs a blog called minimalmathconcepts. What he does is take concepts and illustrate them in a exquisite fashion. Check him out! His work is remarkable.
And if you really like his work, you can also buy his goodies on-line here.
Kudos MMC+ on such a good work and all the very best to you mate 🙂
** When FYP surfaced on Tumblr, we were just another blog. And big giants like space-exploration and mind-blowing-science, were so generous to uplift us. And we are just following the Tumblr tradition 🙂 Cheers!