I want to do something like this diagram in Cox Galois Theory book, using TikZ:
Based on this post I got the nodes and arrows, but I don't know how to do the upward subset symbol.
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Welcome to TeX.SX! You should always provide a small example of code. However, I think, your question already has an answer here. – Jasper Habicht Dec 18 '21 at 17:56
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It iiis, thank u so much :D – Daniel Checa Dec 18 '21 at 17:57