Do you find some mathematical activities useless?

[Maximilian Hohmann]

(04-01-2018 03:08 PM)KF6GPE Wrote:  Does balancing my checkbook count?

Unfortunately balancing my checkbook would never have required the kind of mathematics which yields the 1 trillionths digit of pi :-)

But I was born too late for checkbooks anyway. When I started to do paid work in the mid 1980ies, bank transfer was already the established way to pay one's employees in this part of the world. I actually never ever received a paycheck and wrote very few checks myself before they became obsolete some time during the 1990ies.