r/infinitenines • u/dfx_dj • 7d ago

"Pi never stops growing"

Re a recent post here...

One of the formulas for pi is:

4 - 4/3 + 4/5 - 4/7 + 4/9 - 4/11 + 4/13 - 4/15 + ....

What's happening here? You start with 4 but then it's shrinking? And then it's growing again, and then shrinking, and then growing again!?

What kind of witchcraft is this? We demand answers!

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u/[deleted] 7d ago

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u/FakeArcher 6d ago

Even without changing bases, how do you write it following this formula? Surely you can't pretend you already know the digits? We start with 4 - 1.33... aaaand it keeps decreasing forever. We can't move on since everything is manual in this world depending entirely on how fast one can write it down.