⦗🧛⦘ ⦓☾✹✯𝚅𝚒𝚎𝚕𝚕𝚎✯✹☽⦔ (viellain)

Topology is generally considered to be one of the three linchpins of modern abstract mathematics (along with analysis and algebra). In the early history of topology, results were primarily motivated by investigations of real-world problems. Then, after the formal foundation for topology was established in the first part of the twentieth century, the emphasis turned to its abstract development.