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Exactly! But 1 - 0.999... should be considered the infinitesimalest.

What happens if you divide this “infinitesimalest” number by 2?

What happens when you divide Infinity by 2?

Depends on what you mean by “infinity”. There are various number models that include infinite numbers, with various arithmetic properties.

Restating what you're saying: 1-0.999 = 1/infinity. Substituting and rearranging, 1/0 = infinity. Which is true.

but that symbol already exists. '0'