# "Maths in Japanese" (Math and CS book club)

I’ve read the intro and the first two sections (just now so a bit late on schedule). It’s definitely heavy reading but the history section (自然数の歴史と零の地位) was decently interesting.

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I skimmed the article. I understood most of what I read, with the occasional lookup or opening a link to a another referenced Wikipedia page. I read the general explanation and the parts explaining the suc function with addition and multiplication, but I didn’t bother reading the section about set theory.

I also looked at the related topics that it gave brief overviews of, and then read a bit on the referenced topic 完全数 - Wikipedia, which I don’t think I’d ever heard of before.

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I had figured it that 負 (ふ) means negative(-) a while ago, but I just finally figured out that 正 (せい)means positive(+)

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What do you think about making the vocabulary list collapsible?
Like this:

Various terms

Various terms

Various terms

などなど

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Thanks for sharing everyone.

I agree, the article is way more formal than the videos. It reminded me back to my first calculus lecture at university.

I also looked a little bit into that one. Not sure if I’ve heard about them before but definitely did not remember about them.

Think it is a nice idea. To me it already feels a little bit overwhelming seeing the full vocab list

Do you know if the list will still be searchable if it is collapsed? On the other hand, people might look up an unknown term in a dictionary first anyway and then they will know which part to expand if they want to. What do others think? … and do you mind to take care of it?

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And here is my attempt for some more quizzes. Have fun

Q8 (Introduction) ~ 正しいものを選んでください。

• 整数は自然数に含まれる
• 有理数は整数に含まれる
• 有理数は実数に含まれる
• 実数は自然数に含まれる

0 voters

Q9 (記法) ~ 正しいものを選んでください。

• 自然数は0 を含む
• 正の整数は0 を含む
• N_0 は0 を含む
• N _+ は0 を含まない

0 voters

^ Not sure how to include latex code into polls… N_0 is supposed to be {\mathbb {N}}_{0} and N _+ is supposed to be {\mathbb {N}}_{+}.

Q10 (自然数の公理) ~ 正しいものを選んでください。

• 空集合を 0 と定義する
• 自然数全体を公理化したものは「ペアノの公理」という
• 異なる自然数は異なる後者を持つ
• suc(a) は a + 0 の “意味”

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Q11 (自然数の法則) ~ 任意の自然数 a, b, c に対して 正しいものを選んでください。

• (a + b) + c = a + (b + c)は「結合法則」という
• a × b) × c = a × (b × c)は「交換法則」という
• a × (b + c) = (a × b) + (a × c)は「分配法則」という
• a ≤ b ならば a + c ≤ b + c と bc ≤ ac

0 voters

Again, please don’t be shy and point out any mistakes

Feel free to discuss the quiz in here but maybe use spoiler tags or

hide tags

so others will be warned.

That’s the one I skipped so far. If you like, feel free to add a quiz about it though

Oh, and do you know if I can edit polls after they’ve been published? I’d like to edit in you correction for the Q2 in our first quiz. But I’m not sure if it will destroy the poll and we would leave the votes if I edit the poll or even the post.

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No, you can’t sadly. I think you will get a warning after 5 minutes that you cannot add the poll any more. If you really want to change it, you can only delete it and add a new one (i.e. give it a different ID, I guess). But that will delete all votes, as you suspected.

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I don’t! I barely had the skills to make it collapsible. Feel free to revert it if it’s worse.

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Here’s a question on the history section.

• インド人
• バビロニア人
• 古代エジプト人
• ドイツ人
• 古代ギリシア人

0 voters

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Just type something like
$LatexTextHere$

I’ve already made a few posts in LaTeX like that, and they worked out pretty well.

Anyhow, I hope the readings are going well. I might drop in from time to time (and this thread will be on my ‘Tracking’ list thanks to this reply anyway), but I’m not sure if I’ll be joining you guys in reading these articles. I’m currently 99% certain (I just need a few more minor announcements for confirmation) that I’ve been admitted to an engineering school with a heavy focus on computer science, and I know that one of the first languages that will be tackled is Java, so I intend to use my summer to study in advance and get ahead. As such, I think the most motivating way for me to combine this with my Japanese study (I’m now aiming to hit N1 within the next month or so) is to learn Java in Japanese. I’ll be doing so on Progate, which @NyappyTiramisu once recommended (thank you!), provided the course is free. (I’ll see if it is. If it isn’t… I’ll weigh my options.) I might come back to the Wikipedia articles if I feel the need to brush up on mathematical terminology though. 皆さん、頑張って！

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Thanks for sharing. And I agree with you, it does make sense to not to be able to change the voting options after people already voted. Do you know if I can edit the post around the poll (not changing parts of the poll itself) without loosing the votes?

Awesome. And now I understand the power of these quizzes. Or to phrase it differently… now I want to read the history section of the article as well.

Thanks for checking in. Hope your exams went well as well.
Absolutely go with what fits your personal schedule. We are always happy to have you around but it should never become an obligation (Not saying that you give the impression that it feels like an obligation for you. Just want to let you and others know that everyone can join or step back as they feel comfortable with.)

Beats me what I typed in the last two quizzes It always gave me some error not translating the latex code correctly. I was trying to reproduce the error with this post but now I’m not capable in doing so. I’m encouraged though to give the “latex code inside of a poll” stuff another try with the next quizzes.

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Haha I agree, I actually read some more of the article just so I could answer all your questions

And yes, you can change the text around the poll, it shouldn’t affect anything.

I watched this week’s videos. There is a lot of vocab. I can’t say I remember everything.
The second video was a bit more difficult because he uses a bunch of vocab that hasn’t been introduced, so I relied on the japanese subtitles quite a bit. There’s also some stuff about units that I wouldn’t really call math but that’s interesting too.

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I just watched the fractions video. When I got to the 0.222 part, I knew immediately it was 2/9 because I have that pattern memorized, but I don’t think I’d actually seen that method for figuring out the fraction before. If I did at some point, I’d completely forgotten it. So it was pretty interesting to see that.

Overall, not that many useful terms in the fractions video though, at least compared to the previous two videos. Partly that’s because I don’t feel like memorizing words like 通分 and 約分 though…

The classification of numbers video had a lot of useful terms, but I’d already looked all those up in the last couple weeks, so none of them were new to me.

Hopefully I’ll have time to watch the next two videos this week as well.

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Yet another week past. How did it go for you? Leaned something new or something that surprised you?

… and are you still on board?

Week 4 ~ Are you reading with us?
• I’m reading along
• I’ll catch up later
• I’ll skip this one
• I’ve dropped it completely
• Nope, only here for polling

0 voters

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Finally caught up… which means I’m still one article behind Well, I read the introduction of this weeks WP article but I’m not sure if I’ll go into the details…

Also, after watching the Math 2.1 and 2.2 videos from last week I feel like “trigonometric functions” might not be the best article to solidify the vocab from those videos. How do guys feel? Maybe 幾何学 would have been a better choice?

I also caught up on the “history of natural numbers” part. Thanks @miwuc senpai for sharing the quiz. I was quite surprised when I read that section.

Upcoming week we will learn about data visualization if I recall correctly. So yes, some of the topics are loosely connected to mathematics.

Last but not least… some quizzes about the content of week three

Q12: 平面図形を選んでください。
• 台形
• 正方形
• 直線
• 平行四辺形

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Q13: 円の性質を選んでください。
• 中心
• 半径
• 直径
• 円周

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Q14: 立体を選んでください。
• 円柱
• 円錐
• 楕円

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Q15: 体積を計算する公式は何ですか。
• 広さ \times 長さ \times 高さ
• x 座標 \times y 座標
• 横幅 \times 奥行き \times 高さ
• 面積と同じ

0 voters

Q16: Bonus: 尺貫法の単位を選んでください。

0 voters

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Now I’m able to reproduce the error… although it still puzzles me…

This is the final result how my browser renders Q15 for me:

…and this is how it is supposed to look like:

So, when I go into edit mode it renders the latex code correctly but in final mode it doesn’t

Hope it looks correct for everyone else

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Okay, I managed to read through the 定義 section as well. And I was glad to see some of the terms from the triangle section and circle section in the Math 2.1 video popping up. As well as the basic terms for 1D and 2D spaces as discussed in Math 2.2. Interestingly, 辺 is used for “edge” in a mathematical / geometrical context. So, I really hope you could reinforce at least some of last weeks vocab marathon

Week 5 ~ Are you reading with us?
• I’m reading along
• I’ll catch up later
• I’ll skip this one
• I’ve dropped it completely
• Nope, only here for polling

0 voters

Q17: 三角関数を選んでください。
• 正弦関数
• 余弦関数
• 指数関数
• 対数関数

0 voters

Q18: 実数の範囲の定義を選んでください。
• 直角三角形による定義
• 単位円による定義
• 級数による定義
• 微分方程式による定義

0 voters

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I watched this week’s videos and as usual I enjoyed them and found them really well done. I did have to use the japanese subtitles again though.
However, I haven’t even touched last week’s wikipedia article. I have to say, they’re really a chore for me I might read it eventually, but only out of book club solidarity.

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Thanks for sharing. And sorry for getting back to you this late.

Don’t worry and feel free to skip it. The reading should be enjoyable not draining. Challenging maybe (sometimes) and interesting of course

I think, @Wildjinjer senpai mentioned as well that the WP articles are quite challenging and less engaging than the YouTube videos. If it is okay with you, we can try to find out what it is that makes them less enjoyable or how we can help each other to make them more enjoyable.

I stretched this weeks reading from one to two weeks but in return cancelled the “bonus” article. So we have a little bit more time to discuss the current article or maybe do some vocab collecting / grammar discussion first.

@ everyone…

Before jumping into the next article maybe go through the following questions ~ either for yourself or share your thoughts in here.

• (i) What is the most blocking element to make the WP articles enjoyable / pleasant to read?
• (ii) What is it you’d like to get out of a WP article (section) after reading it?

You can approach the questions from different perspectives ~ Japanese vocab / grammar, math content is exiting / unfamiliar / boring / too abstract / … , interest in reading intensive / extensive, interest in having discussions ~ basically anything. It is our book club so we can shape it the way we want to

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Interest basically. I had no issue reading Wikipedia articles recently for topics I was familiar with and interested in (various arithmetic and geometry articles). Specifically for the second and third articles, I don’t like trigonometry or statistics, so I just skipped them. I’m not familiar with the next topic, but it looks complicated, so I might just skip that one as well.

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