Symbol of Natural numbers

I have been commonly using N\mathbb {N} and Z+\mathbb {Z}^{+} to denote natural numbers. Recently I have come across on some questions the symbol I\mathbb {I}. I have checked various websites and have not found anything to do with the I symbol. Is it a proper symbol? I will be glad to know. Probably, it is used elsewhere in the world and I am unaware.

Note by Joel Tan
4 years, 5 months ago

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Nope, not as far as I know. I try to refrain from using N\mathbb{N} unless it looks super ugly otherwise, to avoid any confusion. I take N=Z+{0}\mathbb{N} = \mathbb{Z}^{+} \cup \lbrace 0 \rbrace as per the Peano axioms.

Jake Lai - 4 years, 5 months ago

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The formal definition of natural numbers exclude 0.

Joel Tan - 4 years, 5 months ago

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Really?

Jake Lai - 4 years, 4 months ago

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Isn't this the symbol for an ideal? click here

Bogdan Simeonov - 4 years, 5 months ago

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I've not see I \mathbb{I} for ideals. They are often just II or JJ.

Calvin Lin Staff - 4 years, 5 months ago

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Oh yeah, it does look different, I thought it was the normal capital I.

Bogdan Simeonov - 4 years, 5 months ago

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I\mathbb{I} is used in India along with mathbbNmathbb{N} and Z+\mathbb{Z}^{+} to represent Natural numbers .

But as far as official use is considered , mathbbNmathbb{N} would be my choice .

A Former Brilliant Member - 4 years, 5 months ago

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