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The question is inspired by this thread on MO. My father is a mathematician, so I remember seeing very nice pens all around. When I started to do math by myself I've realized how important can be a good pen and a notebook with a decent paper. Personally I do prefer thin pens (currently using blue gel Pilot pen) and squared paper, but I am also interested in what do people on MSE like.

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    Though the nib dries out quickly, I like the [Rotring 600](http://www.montgomerypens.com/product_detail.asp?product_id=94) pen. The el cheapo route would be to use a new-fangled gel pen such as [this](http://www.amazon.com/Pilot-Roller-2-Pack-Black-31031/dp/B000T9Q6E6/ref=sr_1_3?s=office-products&ie=UTF8&qid=1337785267&sr=1-3).2012-05-23
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    Wiki-hammered per request.2012-05-23
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    @WillieWong: thank you2012-05-23
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    Would the person who voted to close care to explain? This is certainly of interest to mathematicians and if software that mathematicians use is on-topic as per [faq] then why not hardware?2012-05-23
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    Didn't vote to close, but I wonder if coffee maker recommendations are next :)2012-05-23
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    @TheChaz I can comment on both topics. I suggest Faber-Castell pencils. Just the plain ones. In any case. A mathematician should be able to handle all writing materials. Just like a car driver should be able to drive any car.2012-05-23
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    @TheChaz: I do prefer tea, in particular black with lemon, to coffee because of my origins. Moreover, the point is that a coffee maker is quite bad here, but I can't change it even if I somebody gives me an advise about a better one, while I can switch to a better pen and a notebook (I learnt from uni-ball from the answer here) So I don't think it's similar to a coffee maker :)2012-05-23
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    @t.b.: Paper is soft. The proper term is **treeware**. :-)2012-05-23
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    I was the one who voted to close before t.b.'s comment. Since I was asked: It seemed to me that The Chaz's analogy is closer than the analogy of software, because I think of the latter as more likely to be particular to mathematics (e.g., because the particular typesetting or computational needs of mathematics might come into play). Here it is unclear to me why the answers would be different for poets or crossword puzzle enthusiasts. Thankfully my vote is not binding, and it doesn't look like it will be closed anyway, so this seems moot.2012-05-23
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    @JonasMeyer agree based on [FAQ - Do Not Ask](http://math.stackexchange.com/faq#dontask) this falls under "there is no actual problem to be solved". Even though I personally enjoy these questions and have not down voted this one they are not a good fit for stackexchange.2012-05-23
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    @JonasMeyer: Thanks for the explanation.2012-05-23
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    It should be noted that whiteboards are an inferior medium and good people use blackboards if they can. I'm sure it says so in Leviticus or something.2012-05-23
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    @MichaelHardy: So the erasers are like... burnt offerings?!?2012-05-23
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    @t.b. this question should definitely be closed. This is because it is a discussion and not an actual question, you could have 3 contradicting answers and all of them could be correct and wrong at the same time. It is just a matter of taste in most of the cases, the problem is not 1 question like this, rather if questions like this (which are simpler to ask and easy to answer) start trending. It would not be the first time that happens in a SE site.2012-05-23
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    @JonasMeyer: thanks for the clarification. I'm partly agree with you and although I'm happy with a number of responses, which are very useful for me (and I hope, not only for me), I would certainly understand if the question is closed. I don't think it would be fair for me to discourage people of asking such question, but at least I would like to ask to take it seriously. In my case several months passed since the first intention to ask this question on MSE, before I dared to do that.2012-05-23
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    @TheChaz : Whatever.2012-05-23
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    I generally use blue or black pens but I also like pencils. For the paper when the math is really big, I use the back of old posters, the ones I have here have the dimensions 40cmx110cm approximately.2013-01-24
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    @checkmath: thanks for the comment and for the support. Nice to see that this question is still interesting to somebody :)2013-01-24
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    My life had become a lot better since I started writing in colours. I began doing this on a printout of Hatcher's K theory book. ("What is $p$ again?! And $T$ was defined … where??") Today I was doodling the reflection groups $A_2$ and … guess what … it's easier to read if $\to^{\alpha}$ and $\to^{\beta}$ are different colours.2015-09-17
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    I've also learned (from birdtracks.eu) that monochromacy and lack of diagrams are common _for the printers convenience_, not for the audience or for the writer. Frege's insistence on diagrams in the Begriffsschrift bankrupted him, and if you've tried to TeX a diagram you drew in 5 seconds, you know it's next to impossible. Organisation and clarity are great goals; aping typography (which is itself a stylisation of writing) is not. A few dashes of colour are great for high level organisation or to prevent drift into fraktur A vs sans serif A vs calligraphic A.2015-09-17

16 Answers 16

1

I prefer to use liners. For example, Pigment liners form Staedtler or Topliner from Schneider (that is what I found in the nearby stores). I prefer a width of 0.3 mm.

22

I take the philosophy "beggars can't be choosers". I lose pens like crazy, and despite my best effort at collecting lots of freebies whenever I have the chance, I never seem to have enough pens or pencils. For non-mathematical writing I prefer a good fountain pen--mine never leaves my desk at home for fear of it being misplaced. For mathematical writing I just use whichever implement of writing that is most conveniently within reach (which often ends up being cheap BIC ball-points).

For paper: when I am roving about (i.e. not at my office) I prefer a writing pad with either graph paper (5mm or less spacing) or narrow-ruled paper (college-ruled is okay, but narrower is better for me). I tend to become too messy when using blank paper, so ruled paper stands a better chance of me being able to eventually transcribe it digitally.

In my office, I do about half of my computations and writing directly on computer (I TeX as I go). For the other half I try to be environmentally friendly: I go to the printer room and pick up stacks of discarded print outs; most of those coming from when the laser printer runs out of toner and so most of the page is blank with some faint stripes of text. Since I transcribe these into my computer immediately, the paper quality doesn't matter much.

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    It's relieving to find another narrow-ruled devotee.2012-05-23
19

These pens are incredible. I buy box every semester or so.

For paper, I take 1-2 hundred sheets of plain copy paper (I don't like lines when doing math) to the campus copy shop and get it spiral bound with vinyl covers. The total cost is under $\$4.00$ and unlike Moleskine (which I used for a while) or Mead notebooks, you can turn pages a full $360^\circ$ about the binding and everything is still smooth. Also, the vinyl covers are very durable. Once I started doing this, I never looked back.

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    I'm intrigued, how these pens differ from the usual uniball?2012-05-23
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    @AsafKaragila I'm not sure what you mean by "usual," but they write effortlessly, yet don't bleed. I've tried out many pens but these are my favorite by far.2012-05-23
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    Well, by usual I meant the ones I linked to.2012-05-23
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    Oh, sorry, I didn't see that. I'm not sure how they differ since I don't think I've used those. My guess is they're pretty similar. It's good to know there's another Uniball fan on here!2012-05-23
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    I came here to rant about Uni-Balls, and saw that you can Asaf had already done it for me. One nice thing about them is that they are available all over the world.2012-05-23
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    @Mark: Sadly the store on campus stopped brining them!! :(2012-05-23
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    You can mail-order them by the boxful.2012-05-23
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    I believe that the shipping to Israel would end up vastly more expensive than buying them in a non-discount store off-campus.2012-05-23
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    I like the idea of building your own notebooks like that. However, copy paper is often not pleasant to write on (esp. with fountain pens), so if you want *good* paper that is not a good solution.2012-05-23
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    @Asaf I am dismayed that there is no office-supply company in Israel that offers bulk discounts on common pens. You have my sympathies!2012-05-26
11

I prefer chalk and a blackboard. Not for an audience; I just like to have some space, and it gives me a chance to clean up my work a few times over without wasting paper.

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    I agree, I do enjoy working on the whiteboard when I'm in my office (sadly we don't have blackboards in the university). At home and in travel I prefer something a bit more compact.2012-05-23
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    Sometimes I use a whiteboard, but only to free my mind, like a lonely brainstorming. I won't afford myself write such staff on the paper since I can't erase that :)2012-05-23
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    Do you prefer blackboard over a whiteboard? If so, why? (just curious :)2012-05-24
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    I don't personally have a preference either way. I do know people who prefer blackboards, though, and I am also curious about it.2012-05-24
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    @Svish, Dustan: blackboards have this awesome knocking sound when you write, and the whole process is somewhat musical. Whiteboards just have the alcohol-like smell of markers.2012-05-27
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Any piece of paper (I literally did mathematical things on back of a bus ticket, more than once), but I often have a spiral bound legal pad around.

My favourite pen is Mitsubishi Uniball UB-150 (Micro) Black.

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    Recently I've had a similar experience in a train. I use a plastic card for travelling, so no tickets unfortunately, so I've used a train company booklet2015-07-12
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    @Frank: Yeah, that happens. This is why I included the full name of the pen. I don't see a point in bumping this thread, so I'm not going to fix this.2018-03-14
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The best is a napkin or a beer coaster. That is where all the best theorems were first written. (This is folklore.)

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Technical pencils with an eraser on the end. Any kind of paper.

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    I'm glad to see someone besides me is using pencils! However I'm too clumsy to use typical mechanical pencils (lead breaks every few minutes). Give me a #2 wooden pencil and a pack of yellow pads.2012-05-24
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I like using the Pilot G-2 0.5 roller, preferably black or blue

Usually I use any sort of draft I can for papers, though I always carry a hard-cover notebook in my back-pack, in case I need to write something while standing in the bus or walking.

I really liked unit3000-21's idea of binding draft-papers together, I think i'll start doing that as well :-)

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    +1 for the pilot g2 (though i prefer the 0.7). weirdly i've found the black ink to sometimes be streaky but i've had no problems with the blue ink.2012-05-23
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    Y'know, I've noticed the same thing with the ink, and thought it was in my imagination.2012-05-23
5

Pilot FriXion erasable-by-friction pens are THE BEST. They work amazingly well. Erases instantly and even more cleanly than pencil. http://www.jetpens.com/Pilot-FriXion-Point-04-Gel-Ink-Pens/ct/758

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Pens? They make everything stand out. How do you go back and review notes done all in pen? They also bleed or indent the paper below much more than pencils, created a rather used-paper experience when you turn the page. I think notes are best taken in pencil with a switch to pen for certain highlighting of information. I've done notes and problems all in pen before for studying purposes and like I said, it's like everything is yelling at you, when you go back to review

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    Israeli people are notorious for being loud and rowdy. Living in Israel you get used to everything telling at you, so having the notes yell as well is not terrible! :-)2012-05-23
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    @VISQL That's why you have to use *good* pens.2012-06-10
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I like the PaperMate (formerly Sanford) Ph.D. and Ph.D. Ultra mechanical pencils. They have a big, comfortable grip, a massive eraser (essential!) and hold lots of lead. They are expensive enough that you will take care not to lose them, but not so expensive that you will be bankrupt if you do.

For paper: plain white office paper on a wooden clipboard. On the rare occasions that I write something that I want to keep, it's easily scanned. Otherwise, it's easily recycled. Notebooks tend to accumulate unnecessarily.

2

So, I have been using Uni-ball Signo (DX) UM-151 (0.38) on the Apica CD40SN. If you're in Boston, you can get the notebooks at Tokai at the Porter Exchange. Sadly I am unaware of any US stores carrying the UM-151. The paper is extremely smooth and the interaction of the pen with the paper is really stellar. But sometimes nothing beats loose leaf paper, and there are times when unlined paper is better than lined paper.

The other pen that I think is pretty useful to have around is the Sakura pigma micron 0.2mm, especially when drawing figures.

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Maybe it's a function of the particular writing I like to do, or my puzzle background, but I really like working on graph paper when I'm trying to work something out; being able to sketch out figures with some small degree of accuracy or to veritcally align elements consistently (my alignment has a tendency to drift when I'm not paying attention) is really useful.

I also have a small supply of multisubject notebooks at around 4"x6"; they're just small enough to fit into the pocket of a jacket or cargo pants, easy to pull out on a bus or in line, and the sectioning lets me keep up with two or three different streams of thought without having to jump over irrelevant text.

2

I write notes in pen. Just simple papermate blue. Never black. I do all my work in pencil however (before Tex) and for that I use any pencil I can find. Normally mechanical. SIAM gave out a bunch of free pens to our student chapter and I've been riding them out for awhile.

1

I still prefer the good old fashioned regular pencil and paper (not too picky when it comes to paper.)

1

I use Le Pen from Uchida for nearly everything. They're cheap (I get them at a local art store for a bit cheaper than the website) and they come in all sorts of colors. Uniball and such are nice but I got sick of using such a sharp point.