My sense is that there's a general consensus that the gains to your mathematical life that come from collaboration vastly outweigh any partial loss of credit. In my own career, I spent five years writing almost entirely single-authored papers. In the last six or seven years I have written only collaborative papers. I like a lot of those single-authored papers, but in retrospect, I think those five years were somewhat inefficient. Counterfactuals are hard, but my belief is that I would have gotten a faster start and enjoyed mathematics more if I'd been working mostly on joint papers from the very beginning.
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