I have two questions regarding the development of mathematics:
1) Is there an example where in mathematics, a collaboration has led to the discovery of another result? I already know something like the Polymath project, or the Hilbert program and the Hamilton's program.
2) Is there an example of how individual secrecy and lone effort in mathematics has led to a breakthrough discovery without much contact with the math community? The ones I am aware of are like Andrew Wiles, and Ramanujan.
I just want some more examples cause I was quite curious with regards to certain approaches to mathematical development.