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References to 'division by zero'
1.
$\operatorname{arc tan}$ with two arguments
by
matte
2.
Collatz sequence
by
PrimeFan
3.
Mathematica
by
Mravinci
4.
not a number
by
PrimeFan
5.
proof of l'H\^opital's rule for $\infty/\infty$ form
by
stevecheng
6.
Windows Calculator
by
PrimeFan
7.
zero
by
Mravinci
