José A. Alonso<p>Demostraciones con Lean4 y con Isabelle/HOL de "f(s ∪ t) = f(s) ∪ f(t)". <a href="https://jaalonso.github.io/calculemus/posts/2021/06/06-imagen_de_la_union/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">jaalonso.github.io/calculemus/</span><span class="invisible">posts/2021/06/06-imagen_de_la_union/</span></a> <a href="https://mathstodon.xyz/tags/LeanProver" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>LeanProver</span></a> <a href="https://mathstodon.xyz/tags/IsabelleHOL" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>IsabelleHOL</span></a> <a href="https://mathstodon.xyz/tags/Math" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Math</span></a> <a href="https://mathstodon.xyz/tags/Calculemus" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Calculemus</span></a></p>