……Circle（最初名为“The Math Circle”），全美最早的数学圈，由 Robert 和 Ellen Kaplan[1]于 1994 年在马萨诸塞州波士顿创立，他们也是《Out of the Labyrinth》[2]和《The Art of the Infinite》[3]等书的作者。用 Bob 的话来说，初衷是：“小组成员与带领者围坐在一起，彼此照面交谈；而带领者一如既往，只是抛出一个深刻且令人兴奋的问题（一个可触碰的谜团）……”
…Circle (originally named “The Math Circle”), the earliest math circle in the US, was founded in Boston, MA in 1994 by Robert and Ellen Kaplan[1], authors of such books as Out of the Labyrinth[2] and The Art of the Infinite[3]. The intention, in Bob's words, "Small groups meet with their leader, each seeing and talking with all; and as always, the leader no more than posing a deep and exciting question (an accessible mystery)…
我对数学的兴趣可以直接追溯到《The art of the Infinite》（作者是 Robert 和 Ellen Kaplan）。
My interest in mathematics is traceable directly to The art of the Infinite (by Robert & Ellen Kaplan).
……Circle（最初名为“The Math Circle”），全美最早的数学圈，由 Robert 和 Ellen Kaplan[1]于 1994 年在马萨诸塞州波士顿创立，他们也是《Out of the Labyrinth》[2]和《The Art of the Infinite》[3]等书的作者。用 Bob 的话来说，初衷是：“小组成员与带领者围坐在一起，彼此照面交谈；而带领者一如既往，只是抛出一个深刻且令人兴奋的问题（一个可触碰的谜团）……”
…Circle (originally named “The Math Circle”), the earliest math circle in the US, was founded in Boston, MA in 1994 by Robert and Ellen Kaplan[1], authors of such books as Out of the Labyrinth[2] and The Art of the Infinite[3]. The intention, in Bob's words, "Small groups meet with their leader, each seeing and talking with all; and as always, the leader no more than posing a deep and exciting question (an accessible mystery)…