Hackers' Pub

Syntax	Description	Examples
`"` keyword `"`	Finds the string within quotes, including spaces. Case-insensitive. (Escape quotes inside with `\"`)	`"Hackers' Pub"`
`from:` handle	Finds content written by the specified user.	`from:hongminhee` `from:hongminhee@hollo.social`
`lang:` ISO 639-1	Finds content written in the specified language.	`lang:en`
`#` tag	Finds content with the specified tag. Case-insensitive.	`#HackersPub`
condition condition	Finds content that satisfies both conditions on either side of the space (logical AND).	`"Hackers' Pub" lang:en`
condition `OR` condition	Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR).	`#HackersPub OR "Hackers' Pub" lang:en`
`(` condition `)`	Combines the operators within the parentheses first.	`(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en`

José A. Alonso @Jose_A_Alonso@mathstodon.xyz

4/8/2025, 4:41:32 PM

Public

#Calculemus: Demostraciones con Lean4 y con Isabelle/HOL de "Si f es inyectiva, entonces f⁻¹[f[s]] ⊆ s". https://jaalonso.github.io/calculemus/posts/2021/06/09-imagen_inversa_de_la_imagen_de_aplicaciones_inyectivas/ #LeanProver #IsabelleHOL #Math

Si f es inyectiva, entonces f⁻¹[f[s]] ⊆ s

Demostrar con Lean4 y con Isabelle/HOL que si \(f\) es inyectiva, entonces \(f⁻¹[f[s]] ⊆ s\). Para ello, completar la siguiente teoría de Lean4: import Mathlib.Data.Set.Function open Set Function var

jaalonso.github.io · Calculemus

If you have a fediverse account, you can quote this note from your own instance. Search https://mathstodon.xyz/users/Jose_A_Alonso/statuses/114303335957425897 on your instance and quote it. (Note that quoting is not supported in Mastodon.)