added resources file to dump useful links

comm_alg/resources.lean

@@ -0,0 +1,40 @@
+/-
+We don't want to reinvent the wheel, but finding
+things in Mathlib can be pretty annoying. This is
+a temporary file intended to be a dumping ground for
+useful lemmas and definitions
+-/
+import Mathlib.RingTheory.Ideal.Basic
+import Mathlib.RingTheory.Noetherian
+import Mathlib.RingTheory.Artinian
+import Mathlib.Order.Height
+
+variable {R M : Type _} [CommRing R] [AddCommGroup M] [Module R M]
+
+--ideals are defined
+#check Ideal R
+
+variable (I : Ideal R)
+
+--as are prime and maximal (they are defined as typeclasses)
+#check (I.IsPrime)
+#check (I.IsMaximal)
+
+--a module being Noetherian is also a class
+#check IsNoetherian M
+#check IsNoetherian I
+
+--a ring is Noetherian if it is Noetherian as a module over itself
+#check IsNoetherianRing R
+
+--ditto for Artinian
+#check IsArtinian M
+#check IsArtinianRing R
+
+--I can't find the theorem that an Artinian ring is noetherian. That could be a good
+--thing to add at some point
+
+
+
+--Here's the main defintion that will be helpful
+#check Set.chainHeight