I was doing real work back then

It’s been some hours. Some hours since I last slept (almost 20, to be precise), and I still have stuff to do. Some hours since I’ve created this blog (maybe around 30) and I’m already writing a third post – and they say drugs are addictive. Some hours since math educator Bryan Penfound started following me on Twitter.

Can’t say it wasn’t a big moment for me. I’ve took a deep breath and done my best in not tweeting “@BRYAN’S FOLLOWING ME!!!1!!1 #EMOTIONS WEE HOO”. I thought, “wait, I hold a great respect for this man’s work and his posts have been very helpful in guiding my current research. What will he think of me if he knows I reacted to this like fandoms reacts to pop superstars? Is this how I would like to introduce myself to this group?”

So I’ve chosen you, Mr. Penfound, to be my first direct contact on this community of math blogs. As to many other blogs recommended to me, your’s is one I’ve been following silently for some time. So if you would give me a few minutes of your attention, I would like to share a personal story that I remembered today and I think it’s somehow related to your last post.

I was in Brazil’s fifth grade. It was 2007, I was eleven years old. We were currently learning about different number systems (binary and hexadecimal as alternatives to our decimal system). The ones in class who were using it for fun were making coded messages in the hexadecimal (something similar to ASCII code), and some of the others were just not caring much. I, though, was deeply fascinated by the binary system.

Maybe because it’s look on paper reminded me of Matrix and made me imagine myself like Neo, fighting the machines. Or maybe because it reminded me of computers and made me imagine myself like a hacker. But it had one thing that the hexadecimal had not: it could represent all the numbers with only two symbols. I’ve thought to myself, how can this be? It seems to be way simpler than the decimal system, so why don’t we use it?

My school had a very, well, “traditional” tradition. Even since young, we were prepared to pass on college admission exams, so our classes were lectures on the concepts and then lots and lots of practice exercises. For the younger students, this was less rigorous, but in high school was almost a dogma. But this doesn’t mean that I haven’t had (is this really correct? because it sounds very wrong) inspiring teachers.

One of them was called Mr. Daniel. Everybody loved Daniel. People could hate math, but they loved Daniel. He taught us concepts like number factorization, geometry, geometric constructions, and many others. He was also our friend and taught us how to be better people, or at least less little-devils. He wasn’t the one teaching number systems though, that one was Mr. Paulo, another very inspiring teacher (but because of other stories). But after class, I would always go to talk about math with Daniel.

After another class on the number systems, I went to Daniel to explain my thoughts on the binary system. I would say, “They seem to be so simple, and yet we have none of the arithmetic tools of the decimals available to us. Why don’t we use them for counting, and making operations?”

Daniel proposed me: “Well, we don’t we start developing those arithmetic tools right now?”. What followed next, was Daniel and me doing a very detailed study of what made the decimal much more popular than the binary. We did not discussed matters of history, why we have ten fingers on each hand, electric circuits and none of that. I was very naive and believed that people didn’t used binary simply because they haven’t thought much about it before. So we started looking for deficiencies of the binary that were healed in the decimal.

The first one was reading the number itself. We we’re so adapted to the Indo-Arabic digits that we couldn’t look at a binary number and relate to the quantity as quick as we can do with a decimal number. So we started thinking of how we could make the ‘reading’ process easier.

We thought that the problem with binary was that we counted it from right to left – first converting the digits into powers of two, and then adding them together. I thought of the following way to read them left to right: The first digit you read will be a 1 (let’s not think of the number 0). From then on, when you move a digit to the right, you double the number you’re thinking and add the value of the new digit. So reading 1011 would be:

  1. First digit is a 1.
  2. Next digit is a 0, so my value is 1×2 + 0 = 2.
  3. Next digit is a 1, so my value is 2×2 + 1 = 5.
  4. Next digit is a 1, so my value is 5×2 + 1 = 11. My number is 11.

This was simply a reversal of the first process. But dude, it felt awesome. I was probably that fastest binary reader in the whole school, though no one except me and Daniel knew it and we were probably the only ones that cared. I was like “This is what Paulo should be teaching us during class. Let’s make a revolution and drop the old system!”. This skill is something I never forgot and I have always used it since then to read binary numbers. Back in High School, I could read binary numbers of several and several digits fairly quickly – though I must say I’ve done some little tweaking to the method along this years.

After that, came the problem of writing binary numbers. That algorithm was good for reading, but terrible for writing: multiplying by two and adding one in each step? You could get out of control and miss your number going that way. So our solution was extending the division algorithm to give us the number. If I wanted to write 11 (it’s in decimal, OK? very poor choice of number) as a binary number, I would do something like this:


The number in binary would be the remainders written backwards! But this method, sadly, took up a lot of paper space. We wanted a more compact one. So we thought one that required knowledge of powers of two, but after that it was easier and took up less space:

Divisao 2.png

On the top left corner we write our number. On the middle column, we write powers of two less or equal to our number in decreasing order. For each row, if the power of two was smaller or equal to the value written on the first column of the row above, we would subtract the power from the value and write the difference on the first column of the row, and mark 1 on the third column as well. If the power was greater than the value, we would just repeat the value and mark a zero. We stop when we mark a zero on the first column, and then zero out all remaining spaces on the third column. The number in binary would be written on the third column!

You see, this was also simply a reversion of the way we were taught to read binary, by converting to powers of two and than adding the results. Yet it felt like this was going to be adopted in days as the next official system by the S.I.

I bought into the pretext that I was discovering something new. That I was working on something that was groundbreaking and no man has ever devised before. I bought into a story were I was the professional. I was tasked with improving the world around me and my tools to understand it (by exchanging the decimals for the binary, can you imagine?), and I knew Daniel was expecting me to succeed. Not to fail so he could show me why is it bad or impossible or worse than the actual standards. He believed that I could reach whatever answer I wanted, and gave me the desire for answers. Forget Wiles and his Fermat proof, I was doing real work back then.

After that we moved on to algorithms for the basic operations, and when we reached algorithms for factoring I’ve already understood that underlying all my methods I was using the decimal system, in my head. My calculations were written in binary, just as much as my answers. But once we left the mechanical world of the basic operations, all the metal effort was being done in decimals. We were trained since young for using them, and today I would say, personally, that they yield a good ratio of representation of quantity and paper length.

I still have a draft from the conclusions we wrote that day. The final paper got lost somewhere in the void. But I still keep the reading technique sharp. And my memory of this experience alive, just as many other experiences where I was motivated by my teachers to pushing my knowledge and understanding to a critical, limit point, where repeating what I’ve seen wasn’t efficient anymore and I would need to reinvent myself. Experiences were I was instructed to try something different than drill. It was from that moment on that I was always on the look for an alternative answer (“This could be could be converted to cubic meters, but the calculations are easier in gallons of oil!” – another story that gave me vivid memory and a 0 on a physics test).

As a student, when I felt like I could take on a more advanced task, I would crave for it. Then, I would love to be given a situation where I would need to think as a professional. I would also lose interest in the drill exercises. Getting my Middle School me to do repetitive work was hard, and at High School, impossible. But asking me to try and discredit the decimals? Right away. Find a divisibility digital criteria for arbitrary numbers? Why not, let’s try. Organize a school riot in response to a S.I. debate on a physics test? Probably the best thing I’ve ever tried and failed.

Providing motivation, opportunity and a damn good feeling of reward. I’d say these are things I’m learning from the math education blogosphere/blogoball/blogowhat? and that are indispensable principles for every teacher.


Chapter 1 (or should it be chapter 4?)

I’m sitting in my (mother’s) desk in my (mother’s) summer house thinking (or should it be procrastinating?) about what I should write next.

I’ve just came back from a trip to the capital of the state (100 km from here) to discuss economy, history and stock market with a market analyst (my mom’s friend) for one of my research topics. The discussion was very rich, which means my advisor now has a new e-mail to read way way bigger than the limits of the ‘healthy’. But I’ll only start working the new ideas on the next week.

I’ve also finished some assignments from a math teacher in the department (whom is to me a research advisor at heart) on group extensions. On his last e-mail, he told me I’ve not properly answered the initial questions, so I’ve rewritten everything for more clarity (and asked my mom to grammar check it and verify it). Which means my advisor-at-heart now has a new e-mail to read way way bigger than the limits of the ‘healthy’, and way way way bigger than what he would like to receive. But again, I’ll only start reading new material on the next week.

This week I need to prepare math classroom activities for 11-years-old using what I’ve learned from tons of web searches and what I haven’t learned from math classes I have not yet taken. Shouldn’t be that hard, yikes! (How do you English/American people use this slang? I feel like I’m comfortable to speak a language only when I can use slangs and ‘swear words’ in the proper context)

I have not written a single word so far. Well, I have. I have written several words of introduction to the material and acknowledgments and citations and translations of motivation articles and etc. But about math classroom activities per subject, not a single word. I’ve written ‘\chapter{Formas geométricas espaciais}’ (geometric three dimensional figures/forms/solids/stuff [?]), which should be the header for my comments on Chapter 1 of the textbook. But LaTeX changed it to ‘Chapter 4’ to remind me of having spent hours writing introductory notes (all of them which my mom grammar checked and verified).

And to quote my self (the initial quote on the material is ‘[insert quote here] – myself’ while I search for a nice, catchy one), so I’m blogging. Again.

I must start writing soon. In five days I’ll be back to Brasília, almost 900 km from my aunt and her school, and will be more difficult to send material and to explain it. I will start it soon. But for some reason I found it to be important to write this post. I feel compelled to get in touch with the math bloggosphere/blogosphere/sphere of blogs. Almost a deep irrational desire. Something in the lines of what you feel in high school when thinking about asking a girl out.

So I’ll leave a question to the manifold of blogs, as it’s normally done. Not like the one you do when asking a girl out, neither the one your mom does to her when you bring that girl home (if such things actually happen before college). However, it has it’s similarities with the crush-girl case: my audience, so far, is imaginary.

Will I start talking to someone on twitter and ask them to reply to my question? Maybe. But now I’m going to Google ‘polytopes’. And for some deity’s sake write something really useful.

I ask, did you also judged yourself and felt like a ‘hipster’ (in the negative sense) when you started blogging? Does it feel that strange to share your life for the first time with strangers, thinking that you could be saying a lot of wrong stuff you don’t really know about to people who really know about it (just like ‘hipsters’, in the negative sense)? Also, is it normal to have your mom behind you, helping you to get your immature stuff together into something presentable, at the age of almost 20 years old?

Thanks for the patience,


So I’m blogging (sic)

The title says pretty much how I feel.

First, SO, I’m blogging. I’m going 20 years old this year. Just dropped out of my undergraduate course in Economics to begin the trip on my first semester in Mathematics. University has been a rich but fuzzy, twisted and inebriated period of my life. Also, I’ve been myself a little fuzzy, a bit twisted, a lot inebriated and certainly not rich during the two years I’ve already spent in it. There has been great experiences, not so great experiences and apparently some experiences which I have no memory of.

But enough about it. I’ve been in general a good student during those two years, but recent events (a very motivating entrepreneurship environment and three research opportunities) shifted me towards hard work and search for excellence. Though I can say this change restricted itself to work – my friends still see me as the person too lazy to get up from the couch and go to sleep in a bed.

Second, so I’M blogging (this is pointless in English and a already capitalized I). I’ve already said a lot about me. More than I’ve planned for this first post, in some sense. Well, my objective in Mathematics is primarily research. I want to know what modern math already knows, what follows from it and why the hell does people instantly recognize S3 by just looking at the semidirect product of C3 by C2. And if I can, leave my contribution to it. It may happen to be the resolution of the Jordan-Hölder program, but I’m happy with way way less. The resolution would be cool tho. That said, this last sentences are a joke. Something I give much thought about are the reasons for studying math and sciences, and though I still haven’t a complete opinion on the subject, ‘glory’ or ‘fame’ are things I look with apprehension. Maybe it’s all a joke. I’m sure I’m a lot funnier in Portuguese.

I guess I forgot to mention that. I’m from Brazil, land samba beaches and Artur Avila. Between me and my mathy friends we have a joke about fantasizing Avila teaching us math at the beach. Let’s hope you don’t read this, Avila, or at least if you do read, know we are in the best of intentions. Also, other than research, I’m very interested in math education (and communication as a hole). Even since high school I’ve had some (much more complete) opinion on how math is taught at our schools. Now, with a two word title (which receives maybe more respect than others with the same level of party frequency and alcohol consumption) and contact with professionals, I can make my opinions not only more complete but also more correct, and thus more applicable-to-something-more-than-Internet-ranting.

Third, so I’m BLOGGING. My first objective with this blog was to get in touch with the math blogosphere (is this how you say it?). One of my three researches is in math education and is not exactly academic research. I’m writing comments, suggestions and classroom activities for my aunt, who is head-mistress at a school in a small city. One of her classes is having a lot of trouble with math, and I’m compiling (and translating) all the material I could find on-line to help her teachers and students to overcome the trouble. I pretend to document part of this process.

Also, my other two researches are possible topics here. Sometimes, they make me feel like an offspring of Emmy Noether with David Hilbert, tutored by the Bourbaki group itself. Sometimes, they make me wanna throw myself from a bridge. But that’s normal, I guess. Just like a total random topic that I may write when I want to write it really really bad.

And last, so I’m blogging (SIC). I’m from Brazil. I speak Portuguese. My keyboard and my Linux distro speaks Portuguese. My auto-corrector speaks Portuguese (apparently a different version than mine). The tests I’ve did on my foreign language course six years ago were in English, but my colleagues and my English teacher also spoke Portuguese. But the nationality-neutral scientific community speaks English, so we’ll settle for that. Better than Latin I guess. I’m also starting French this semester, and may go for German once I’m comfortable. Tl;dr: I has not grammar and I may write wrong sorry.

Oh, and if someone reaches this, welcome!