People wrote on this site that there is no requirement for a man to pray with a minyan as a general rule. I took this to mean that one need not attend a minyan he knows meets regularly, instead praying alone. This surprised me: indeed, it contradicts what I've known all my life. I seek support for there being, or not being, any requirement that a man, in order to pray sh'mone esre, attend a minyan he knows meets regularly.
Now, the Shulchan Aruch's language, in introducing the idea of prayer with a minyan (OC 90:9), says only "Someone should try much to pray in the synagogue with the community". This sounds like something less than a requirement. However, he goes on (:16) to say a traveler "must" go out of his way to pray with a minyan. That sounds like a requirement. So I don't think one can prove anything from the Shulchan Aruch per se, and I seek only clearly stated views on the issue from later halachic authorities.