initial commit

.vim/ftplugin/setty.vim

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+abbrev forall ∀
+abbrev exists ∃
+abbrev not ¬
+abbrev and ∧
+abbrev or ∨
+abbrev intersect ∩
+abbrev union ∪
+abbrev in ∈
+abbrev notin ∉
+abbrev minus ∖
+abbrev to →
+abbrev != ≠
+abbrev <= ≤
+abbrev >= ≥
+abbrev implies ⟹ 
+abbrev iff ⟺ 
+abbrev epsilon ε
+abbrev powerset ℘
+
+" Do the rest of the greek letters
+abbrev @ ∅
+abbrev nats ℕ
+abbrev ints ℤ
+"
+"
+" Should support subset, subseteq