Does anyone know a good resource (preferably pictures) that illustrates a conventional way to write the special sets symbols, i.e. $\mathbb{N,Z,Q,R,C}$ etc., by hand?
How to write special set notation by hand?
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$\begingroup$
notation
online-resources
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1In my experience, you kinda just make it up. I don't know of a 'conventional' way. – 2012-05-31
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6Just for the fun of it, [here](http://i.stack.imgur.com/nI8Y6.png) is blackboard bold in my terrible handwriting. (In addition to it, scanning something written by pen was probably not that good idea.) – 2012-05-31
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0@ Martin I like them! – 2012-05-31
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0@Martin : I write them exactly the same! Except that you sketched the $\mathbb C$ very bad. But I use the same technique :P – 2012-05-31
2 Answers
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I don't think anybody duplicates mathblackboard very exactly. I'll describe what I do.
For $\mathbb{N}$, I draw the left vertical and a diagonal as normal, then I start over drawing another diagonal parallel to the first, then finish the right vertical. I do something similar for $\mathbb{Z}$.
For $\mathbb{R}$ and $\mathbb{H}$ I write an $R$ or $H$ as normal and then just double the left vertical. For $\mathbb{Q}$ and $\mathbb{C}$ I write a $Q$ or $C$ as normal, then add a vertical secant line close to the left side.
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7I mostly do the same, except for my $\mathbb{N}$ I double the left vertical (like $\mathbb{R}$ or $\mathbb{H}$) instead of the diagonal. – 2012-05-31
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0@WillieWong I know I used to do that! I didn't realize I stopped. I think my method for doing $\mathbb{Z}$ probably became contagious and changed my $\mathbb{N}$. Anyway, I would like to endorse that as a completely standard thing, too. – 2012-05-31
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Well this is the way I draw them anyway :)
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2terrible choice of background color, but I like it ;) – 2012-05-31
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0ahem! Doesn't it just jump out at you :) – 2012-05-31
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1Your $\mathbb{N}$ is “incorrect” in that a capital N in any serif font has the diagonal thickened, not the verticals. In fact, the rule (in Latin alphabet) is that negative slopes are thick, positive ones are thin. Verticals are sometimes thin, sometimes thick. Unique exception: Z. Just look in a newspaper at A, V, X, M, and N. – 2012-05-31
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1@Lubin: it's a matter of personal choice. The Latin rule is interesting though, never heard of that. – 2012-05-31