REVIEWS

• Michael Berg [Mathematical Association of America Reviews]
  This book has to be seen to be believed [4 Sep 2008]
• J. Moldovan [amazon.com]
  A beautiful work you must have [23 Oct 2008]

BLOGS

• José Antonio Ortega Ruiz [physics musings]
  Geometrically speaking [6 Jul 2006]
• John Baez [This Week's Finds in Mathematical Physics]
  This intro to Lie groups is also a bit quirky [24 Dec 2007]
  Diagrammatic approach to Clebsch-Gordan coefficients [6 Feb 2001]:
  "a really cool book by a guy named something like Ctanovic, which is presently almost impossible to find unless you're a wizard. (This book will eventually be published more widely, after what's-his-name inserts a section on diagram techniques for exceptional Lie groups!)"
  What's-his-name Ctanović responds: "It is true - I had a dinner once at a friends' house with Joan Baez, but I declined her offer of a ride home as I was on a bicycle."

CORRESPONDENCE

• Roger Penrose [29 Oct 1981]: invented this notation in 1952.
  P Cvitanović: "No contest - as a late starter, I got into the first grade in fall of 1953, drawing pretty much the same kind of drawings. But I did refer to the one Penrose diagrammatic paper I knew about in my 1976 Phys Rev paper, refs 38, 39."
• Pierre Deligne [6 Dec 1996]: "I am most intrigued by your Magic Triangle, p. 9 of your Group Theory book."
• Ben Mottelson [15 Sept 1999]: Unsang heroes.
• David Mermin [29 Dec 2002]: "Don't know how much further I'll get, but ..."
• Roger Penrose [4 Jan 2003]: "There will be some bird-tracks (or fornicating ostriches, as one of my colleagues prefers to call them) in my book too"
• Tony Smith [17 Feb 2003]: "where was the Magic Triangle first discussed?"
• Dorte Glass [21 Nov 2008]: at sidde og tyde dine hieroglyffer..."