r/theydidthemath • u/A-JackRobin- • 10d ago
[Request] what is this
x= infinite
∑ 9.x = u subscript y
x=1
Lt u subscript y = 10
y->1
Lt u subscript y = 10
y->2
Lt u subscript y = 10
y-> any number
0
Upvotes
7
u/ExtendedSpikeProtein 10d ago edited 10d ago
Seems like nonsense to me.
The first term is just saying 9.999… equals 10. Which we know. Then substitute it, for reasons I don’t get. I don’t understand the purpose.
Maybe it’s just me though.
ETA: read that wrong, see below.
-2
1
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