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added bullets and the definition of an ideal from mathlib

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@ -6,19 +6,22 @@ We start the commutative algebra project with a list of important definitions an
Feel free to add, modify, and expand this file. Below are starting points for the project: Feel free to add, modify, and expand this file. Below are starting points for the project:
Definitions of an ideal, prime ideal, and maximal ideal - Definitions of an ideal, prime ideal, and maximal ideal:
```lean
def Mathlib.RingTheory.Ideal.Basic.Ideal (R : Type u) [Semiring R] := Submodule R R
```
Definition of a Spec of a ring - Definition of a Spec of a ring
Definition of a Noetherian and Artinian rings - Definition of a Noetherian and Artinian rings
Definitions of a local ring and quotient ring - Definitions of a local ring and quotient ring
Definition of the chain of prime ideals and the length of these chains - Definition of the chain of prime ideals and the length of these chains
Definition of the Krull dimension (supremum of the lengh of chain of prime ideal) - Definition of the Krull dimension (supremum of the lengh of chain of prime ideal)
Definition of the height of prime ideal (dimension of A_p) - Definition of the height of prime ideal (dimension of A_p)
Give Examples of each of the above cases for a particular instances of ring Give Examples of each of the above cases for a particular instances of ring