Added the holomorphic functional calculus.

refs.bib

@@ -141,3 +141,13 @@
   year={2016},
   publisher={CRC Press}
 }
+@book{Takesaki1,
+  title={Theory of Operator Algebras I},
+  author={Takesaki, M.},
+  isbn={9783540422488},
+  lccn={79013655},
+  series={Encyclopaedia of Mathematical Sciences},
+  url={https://books.google.ca/books?id=38QIwQEACAAJ},
+  year={2001},
+  publisher={Springer Berlin Heidelberg}
+}