10.2 Conventions
A ring is commutative with 1. The zero ring is a ring. In fact it is the only ring that does not have a prime ideal. The Kronecker symbol \delta _{ij} will be used. If R \to S is a ring map and \mathfrak q a prime of S, then we use the notation “\mathfrak p = R \cap \mathfrak q” to indicate the prime which is the inverse image of \mathfrak q under R \to S even if R is not a subring of S and even if R \to S is not injective.
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