Flammable Maths
Jens Fehlau, also known as Papa Flammy, is a German YouTube creator known for worked maths problems, physics lessons and mathematical comedy.
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Latest
Jens’s happenings, collected from public sources, plus his backstory and Starbook, where fans write.
Known for
YouTube
YouTubeOverview
- Name
- Jens Fehlau
- Also known as
- Papa Flammy
- Based in
- Germany
- Started
- 2017, with German-language maths videos
- Signature hit
- How REAL Men Solve Equations, a 2020 comedy short with more than 11 million views
- Beyond YouTube
- Co-founder of STEMerch with Zach Star
Mini bio
How it started.
Jens Fehlau began posting maths videos in 2017. One of his earliest uploads explains the improper integral of 1/(x⁴+1) from zero to infinity in German, and its description links to an English version. The channel grew into a mix of worked problems, proofs, physics lessons and jokes about learning maths.
Maths with a mischievous streak.
His short “How REAL Men Solve Equations” turns the simple equation 8x = 1 into an excuse to misuse the quadratic formula. Released in December 2020, it has passed 11 million views. That same year, he teamed up with Tom Rocks Maths for “Maths Exams Be Like…”.
Making things together.
In mid-2020, Jens and fellow YouTuber Zach Star came up with STEMerch, a shop for science-themed designs and products. At Christmas that year, Jens organised “A Story often told”, a charity singing collaboration featuring creators including 3Blue1Brown and Veritasium. Its accompanying album credits Stefan Perko and Johann Beurich for the song and instrumentals.
A change of pace.
After sharing more maths and physics lessons in early 2026, Jens posted “Thank you for everything.” in May. Wikitubia records it as his announcement that he was stepping away from maths videos. An August upload, “Making Soda from Scratch”, took the channel into water-kefir fermentation.
Creditschronological, newest first
- 2020A Story often toldOrganiser and performer in a STEM charity singing collaboration
- 2020How REAL Men Solve EquationsCreator
- 2020Maths Exams Be Like…Collaborator with Tom Rocks Maths
- 2017Integral 1/(x^4+1) von 0 bis UnendlichCreator and presenter
Quotes
Good morning fellow mathematician!Flammable Maths, Patreon introduction
His greeting to readers of his Patreon About page.
Trivia
- He calls his community the “Flammily”, a name used in his channel-membership invitation.
- STEMerch lists “Memes” among his responsibilities, alongside design and customer service.
- On Patreon, he says supporters helped him buy a camera and a Microsoft Surface Pro for editing away from home.
Find Jens
Follow Jens for maths, physics and his latest experiments.
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