# Tagged Questions

The Japanese language as used in mathematical writing.

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### 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 ...
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### 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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### 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 ...
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### 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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### 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 ...
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### 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 ...
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### 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 ...
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### 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. ...
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### 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". ...
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### 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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### 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, ...
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### 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 ...