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References to 'kernel'
1. $\Psi$ is surjective if and only if $\Psi^\ast$ is injective by matte
2. Chinese remainder theorem for rings, noncommutative case by polarbear
3. connection between Riccati equation and Airy functions by perucho
4. construction of an injective resolution by guffin
5. every congruence is the kernel of a homomorphism by almann
6. exact sequence by antizeus
7. field homomorphism by alozano
8. proof of Kummer theory by rm50