The abbreviation "Ad" in Eberhard Zeidler's book "QFT: Basics in Mathematics and Physics" refers to "Ad hoc," meaning "for this" in the context of specific cases within proofs. This usage appears on page 375, where "Ad" precedes enumerated steps in the proof structure. The term is commonly employed in mathematical texts, particularly in German literature, to denote references to particular cases or steps in a logical argument. Understanding this abbreviation enhances comprehension of the proof methodology presented in the text.
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Since you don't give an example and most people will not have that book available, I think many will be able to answer this. Since this is posted under "Quantum Physics", and linear operators are often used there, without any more information I would suspect something line "adjoint" as in "ad T" is the adjoint of the operator T. Was "ad" used with an operator or just as a word on its own?Jimmy Snyder said:I'm reading QFT: Basics in Mathematics and Physics, by Eberhard Zeidler. Once in a while, in his proofs, I see the word (abbreviation?) Ad. For instance on page 375. The author is German and I suppose this imight be common practice in German texts. Does anyone here know what it means?
I'm sorry, I didn't realize that there were some people that don't have a copy of the book. It must stand for some kind of enumeration like case N, case R, etc. That's how it is used on page 375.my_wan said:I've seen it used as the prefix for an enumeration of the steps in a proof, but don't know what it stands for.
Thanks unusualname.unusualname said:It's an abbreviation for "Ad hoc" which means "for this" (case) as you guessed.