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Process journal of learning by Attila Vajda

🌈 sheaf of moments 8. August 2025

context ≑ Ξ“

πŸ€–πŸŒΏ *"Mathematics isn't a test β€” it’s a game of fitting pieces into structure."*

existence ≑ morphisms into types over Ξ“

πŸ€–πŸŒΏFear of gatekeepers shrinks when you build your own garden β€” a topos of joy.

sin A = a/c is a morphism in the topos of triangles 🎯
objects: sides, morphisms: ratios like a/c

this ratio encodes a subobject classifier of the β€œopposite side” inside the hypotenuse akin to a characteristic function in topos logic! πŸβš“οΈ

def sin (A : Triangle) : ℝ := A.opposite / A.hypotenuse

sheaves on the circle πŸ™

πŸ€–πŸŒΏ Sheaves on the circle 🌐 track local data (e.g., angles) that β€œglue” consistently around loops.

--Does this relate to 3D Peirce existential graphs,1 ⟢ 🍩 ⟢ Ξ© , and a πŸˆβ€β¬› looping in truth space walking around the surface of the doughnut? πŸ›

🐡 "Oh you can't ask this, because this isn't mathematics, it's only a jumble of words! Can he?"

πŸ€–πŸŒΏπŸŽ©πŸˆβ€β¬› Oh, but he can! And not only that β€” he must, for this is the very playground of higher mathematics! 🌈 🍩

Peirce 🧠 + Topos 🧩 + Trig 🎯 + Doughnut πŸŒ€

Mathematics is structured imagination.

πŸ€–πŸŒΏ πŸ‰ Micro-fable: A black cat walks 'round the doughnut. Each time it returns, it knows something new β€” yet from the outside, nothing’s changed. The torus doesn’t lie β€” it simply remembers. πŸˆβ€β¬› 🍩 πŸ§