The Japanese language as used in mathematical writing.

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4
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2answers
638 views

How is「第3位を四捨五入」deconstructed to mean “round up to 2 decimal places”?

小数第2位未満に端数が生じた場合は、小数第3位を四捨五入する I initially translated this sentence to: If a fraction with less than 2 decimal places is generated, round off to 3 decimal places. So: 2.1 ≈ 2.100 It felt ...
4
votes
1answer
216 views

Inequality symbols in Japanese writing

In English, when we wish to write a non-strict mathematical inequality, we will write something like this: x ≤ 3 or y ≥ 5 In Japanese writing, however, I have also seen the symbol ≦ used to mean ...
6
votes
1answer
158 views

How does one read AxB as in “A by B grid” in Japanese?

Here's the definition of sudoku in Wikipedia: 数独(すうどく)とは、3×3のブロックに区切られた 9×9の正方形の枠内に1〜9までの数字を入れるペンシルパズルの一つである。 How should one read 9×9の or 3×3の out loud?
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3answers
412 views

How do you read simple arithmetic equations in Japanese?

My dictionary (EN->JP) suggests to translate "Three multiplied by four is twelve" as 3 × 4 = 12 without giving a hint as to how to read this in Japanese. How do you read simple arithmetic ...
5
votes
1answer
205 views

Why is topology called 位相幾何学?

Topology in English is called 位相幾何学 in Japanese; also, topological space is called 位相空間. But why is topology called 位相幾何学? What is the correspondence between topo and 位相? What is the origin of 位相?
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1answer
237 views

What was the base for Japanese numbers?

I'm curious what the numerical base the Japanese used before their introduction to the wider western world. I've been taught in my Japanese language classes that they move the comma to a different ...
4
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3answers
432 views

Are non-base-10 numbers ever written in kanji?

This morning I was thinking about the joke "There are only 10 types of people in the world: those who understand binary, and those who don't". Considering if this would translate well to Japanese, I ...
6
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1answer
124 views

How to express the concept of negation in mathematics

I have been reading the PHP manual in both Japanese and English and have reached the part about operators. In the 代数演算子 section they talk about 加算, 減算 etc, and have a table showing all of the 代数演算子 ...
4
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3answers
174 views

How to read the Modulo operator in a formula

Because I am a programmer, I have been reading tutorials and manuals about programming in Japanese. For the most part I am ok with all of the terminology, both from the computing side and maths side. ...
10
votes
3answers
301 views

What's the difference between 三角 and 三角形?

I just had this terrifying conversation: What is "triangle" in Japanese? me: 三角 right? Then what's 三角形? me: Uhh... triangle? I've confirmed both of these translate to "triangle". ...
5
votes
1answer
953 views

Expressing “not greater/less than” and “greater/less than or equal to”

I'm having trouble coming up with a way of saying "not greater than 0" and "not less than 0". Would the following sentences be natural/grammatical? If not, in what ways can the following be ...
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4answers
293 views

以上 vs 以上 for numbers vs words: half full/half empty?

Well, 以上 is used after a speech to indicate that the speech has been concluded (i.e., 'Everything before this has been said.'). 以上 is used in numbers to mean 'or more', as in 八十%以上 (as in, ...
12
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3answers
358 views

The etymology of 関手【かんしゅ】

In Japanese mathematics, the word ‘functor’ is translated as 関手【かんしゅ】. What is the etymology of this word? I suspect that it is a pun on 関数 (function). This leads to two further questions: Why 関手 ...
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6answers
1k views

Japanese dictionary for mathematics/computer science jargon

I study mathematics and computer science, and I'm starting to learn japanese. Could you suggest me dictionaries/sites/etc where I could learn terminology on these subjects?
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4answers
369 views

Pronunciation of 閾値 : いきち or しきいち?

Last week I saw the word 閾値 and when looking it up in Gjiten I see two pronunciations, both marked as "popular": 閾値 (いきち) (n) threshold (amount, dose, etc.); (P); 閾値 (しきいち) (n) threshold (amount, ...