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References to 'prime subfield'
1. characteristic by Mathprof
2. field homomorphisms fix prime subfields by Wkbj79
3. finite field by yark
4. ground fields and rings by Algeboy
5. non-isomorphic completions of $\mathbb{Q}$ by pahio
6. p-adic canonical form by pahio
7. perfect field by sleske
8. Q is the prime subfield of any field of characteristic 0, proof that by CWoo
9. semilinear transformation by Algeboy
10. theory of rational and irrational numbers by alozano