Against toposes

The French anthropologist and ethnologist Claude Levi-Strauss once observed

“In Paris, intellectuals need a new toy every 15 years.”

Some pointers to applications of their toy of choice for the past ten years:

• Langlands correspondence (see here)
• Riemann hypothesis (see here)
• Machine learning (see here)
• Literature (see here)
• Psycho-analysis (see here)
• Design theory (see here)
• Haute cuisine (see here)
• 6G (see here)
• …

How do Parisian mathematicians with a lifelong interest in topos theory react to this hype?

With humour!

Here’s an ‘exposé parodique’ (parodical lecture) by Stéphane Dugowson on “Contre les topos” (against toposes).