The result from `1 RET 0 /` will be the formula 1 / 0.
The "function"

The `m i` command enables an **infinite mode** in which 1 / 0
results in a special symbol that represents "infinity." If you
multiply infinity by zero, Calc uses another special new symbol to
show that the answer is "indeterminate." See section Infinities, for
further discussion of infinite and indeterminate values.

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