# Tagged Questions

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### How to pronounce “R → ∞ ” in a mathematical context

For example on this wikipedia page: 一方、右辺第二項は R → ∞ のとき 0 に収束するので、... In English it would be something like "as R goes to infinity". How would you usually read this in Japanese?
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### How to say at most one?

Let's assume that I want to define the concept of injective function: A function f is said to be injective if each element of the domain has at most one image. which would become something like ...
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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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### How do you say “if and only if” in Japanese?

I would like to know how to express mandatory conditions in Japanese. Since Japanese distinguishes between different types of languages, I should probably ask more precisely: What is the right way to ...
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### Maths sentences: 足す and 掛ける

I noticed a lack of case marking particles in mathematical sentences: １足す２は３である。 ３掛ける４は１２である。 足す and 掛ける are verbs, does subject and object analysis apply to this? Do they take on the ...
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### Does 「7分の1」 mean 1:7 in this sentence?

Found a sentence, 人間の身体能力は吸血鬼の7分の1しかありません Is this how you write ratios in Japanese?
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### Sentence ending with こと or もの in mathematics definitions

I'm reading a mathematics textbook, and there are a number of sentences which end with もの or こと. I can work out the intended meaning no problem, so what I would like explained to me, are the rules ...
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### How do i say “for every x, show that P(x) is true”?

i've been learning japanese for 2 and a half years now. for a few weeks/months now, i'm taking notes in japanese. Listening to the teacher in french and taking notes in japanese my be challenging at ...
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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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### 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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### 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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### 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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### 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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### 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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### 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, ...
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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 ...