$\newcommand{\defeq}{\mathrel{\mathop:}=}$

## 2010/06/28

### 若且唯若

Max 上課提到「若且唯若」在英文有縮寫 iff，然後說在中文他其實也想造一個字：

--

David Gries: "The notation iff is used for 'if and only if'. A few years ago, while lecturing in Denmark, I used fif instead, reasoning that since 'if and only if' was a symmetric concept its notation should be symmetric also. Without knowing it, I had punned in Danish and the audience laughed, for fif in Danish means 'a little trick.' I resolved thereafter to use fif so I could tell my little joke, but my colleagues talked me out of it."

--
Quoted from The Computer Contradictionary by Stan Kelly-Bootle.

Labels:

jaiyalas6/28/2010 2:15 pm 說：

Josh Ko6/29/2010 12:16 am 說：