> 就德维（Devi）而言，我们不知道她在这场演示中用了什么技巧。为什么？因为她从未告诉过大家。不，我们知道。她也确实公开过。德维在1977年出过一本书，书名叫《Figuring: The Joy of Numbers》。第九章就是“立方与立方根”。Peter S. Magnusson 声称的那些“德维从未透露过的开8位数立方根的秘密”，全都在德维1977年的那本书里写得清清楚楚……
> In Devi’s case, we don’t know what techniques she used for this demonstration. Why? Because she never told people. Yes we do. Yes she did. Devi published a book in 1977, entitled Figuring: The Joy of Numbers. "Cubes and Cube Roots" is chapter 9. All of the stuff that Peter S. Magnusson claims that Devi never told people about taking the cube root of an 8-digit number is right there in Devi's 1977 book,…
……特别难的算法。它其实就是模7运算加上一些除法，再结合查表法。Martin Gardner 当然也讲过这个。我最早是在夏琨塔拉·德维（Shakuntala Devi）的《Figuring: The Joy of Numbers》里看到的，那本书里的查找表稍微有点不一样。多加练习的话，别人刚报出日期你就能同步算出来，这是心算高手为了提速常用的伎俩，而且查找表会直接变成……
…particularly difficult algorithm. It's just modulo 7 arithmetic and some divisions combined with a table lookup. Martin Gardner of course covered it. I first encountered it in Shakuntala Devi's book Figuring: The Joy of Numbers, which has a slightly different lookup table. With practice, one can run it as the date is being given, a common lightning calculator trick for making things faster, and the lookup table becomes directly…
> 就德维（Devi）而言，我们不知道她在这场演示中用了什么技巧。为什么？因为她从未告诉过大家。不，我们知道。她也确实公开过。德维在1977年出过一本书，书名叫《Figuring: The Joy of Numbers》。第九章就是“立方与立方根”。Peter S. Magnusson 声称的那些“德维从未透露过的开8位数立方根的秘密”，全都在德维1977年的那本书里写得清清楚楚……
> In Devi’s case, we don’t know what techniques she used for this demonstration. Why? Because she never told people. Yes we do. Yes she did. Devi published a book in 1977, entitled Figuring: The Joy of Numbers. "Cubes and Cube Roots" is chapter 9. All of the stuff that Peter S. Magnusson claims that Devi never told people about taking the cube root of an 8-digit number is right there in Devi's 1977 book,…
……特别难的算法。它其实就是模7运算加上一些除法，再结合查表法。Martin Gardner 当然也讲过这个。我最早是在夏琨塔拉·德维（Shakuntala Devi）的《Figuring: The Joy of Numbers》里看到的，那本书里的查找表稍微有点不一样。多加练习的话，别人刚报出日期你就能同步算出来，这是心算高手为了提速常用的伎俩，而且查找表会直接变成……
…particularly difficult algorithm. It's just modulo 7 arithmetic and some divisions combined with a table lookup. Martin Gardner of course covered it. I first encountered it in Shakuntala Devi's book Figuring: The Joy of Numbers, which has a slightly different lookup table. With practice, one can run it as the date is being given, a common lightning calculator trick for making things faster, and the lookup table becomes directly…
> Figuring: The Joy of Numbers Archive.org（该章节链接）：https://archive.org/details/B-001-014-505/page/n81/mode/2up
> Figuring: The Joy of Numbers Archive.org (link to the chapter): https://archive.org/details/B-001-014-505/page/n81/mode/2up