Questions tagged [notation]
For questions about good use of notation, comparison of specific notation, motivation of notation.
100
questions
3
votes
2
answers
324
views
Correct notation of a Sample space
From the very beginning I have used the notation $ S = \{ H , T \} $ as the Sample space for tossing a coin once and $ S = \{ HH , HT , TH , TT \} $ in the case of tossing a coin twice.I have several ...
- 1,144
7
votes
3
answers
409
views
Why is it written $\tan^{-1}$?
I was showing my neighbour's daughter how to do simple sine, cosine and tangent questions and their inverses. She could do the questions fine but she asked me why the calculator button for inverse tan ...
- 181
-5
votes
1
answer
117
views
Mnemonics for memorizing the difference between a closed interval and an open interval
Here are some suggestions for memorizing the difference between an open interval and a closed interval.
[a,b]={x|a<=x<=b}
(a,b)={x|a<x<b}
The first thing I would notice is that the bracket ...
-4
votes
2
answers
279
views
Order of operations pemdas
Why was the order of operations established in mathematics with multiplication taking precedence over addition, as dictated by the PEMDAS rule? What historical or practical factors influenced this ...
- 2,384
9
votes
3
answers
1k
views
Is there a standard convention for interpreting ambiguous absolute value expressions?
Consider the expression
$$|x + 2|x + 3|x + 4|.$$
One way to interpret this is that there are two products being added together:
$$|x+2|x \hspace{1cm} + \hspace{1cm} 3|x+4|$$
But you could also ...
- 12.8k
9
votes
7
answers
2k
views
Is there a resource for learning to read mathematical notation/equations/formulae?
Ideally, I am looking for an online resource. But a book or any other would help already.
Background: I am a senior teaching assistant in the field of business and statistics. Most of my students have ...
9
votes
2
answers
2k
views
Explaining Sigma-Notation
I attempted to introduce the summation notation $\Sigma$ to my students. The notation was unfamiliar to the students beforehand. I worked through many examples with them, but for most of them, working ...
- 193
24
votes
5
answers
6k
views
Correcting how a student writes symbols
One of my college students writes the Greek letter $\pi$ as a script n with a bar over it, like $\bar{n}$. [There is actual space between the letter and the bar.] I have never seen this before, and ...
- 9,719
3
votes
3
answers
276
views
Is there a preferred way to format a negative exponent?
Say there's an exam question whose answer is $x$ to the power of negative one. Two ways of writing this are $x^{-1}$ and $\frac{1}{x}$.
I know that questions will sometimes request an answer without ...
- 131
4
votes
0
answers
121
views
Activities that encourage students to create or evaluate mathematical notations
I'm looking for references about activities that encourage elementary school students to create or evaluate mathematical notations. do you know any?
- 2,384
3
votes
5
answers
900
views
Simple examples of how a good notation or diagram can help to solve math problems
I am looking for simple examples of situations where a good notation/diagram was fundamental for solving an elementary problem in mathematics (I am looking for examples accessible to a basic school ...
- 2,384
15
votes
4
answers
6k
views
Parentheses around negative numbers
We teach students that a notation like
$$17 - -59$$ is not acceptable or at least not good. Instead we want them to write $$17-(-59)$$
The main reason seems to be that it's more readable if you ...
- 159
7
votes
4
answers
4k
views
What implication arrows, if any, should I require in teaching?
Q: Solve $x+5=0$.
A: $x+5=0\implies x=-5$.
This answer would be given full marks.
Isn’t it better to tell students to use $\equiv$ or $\iff$? Because that is what lets them say $-5$ is a solution to ...
- 257
2
votes
1
answer
441
views
Do Greek students use Greek letters to denote angles?
In western schools is a tradition to use Greek letters to denote angles. I wonder what about Greek schools do they also use Greek letters to denote angles or do they prefer other kind of alphabet to ...
- 2,384
3
votes
3
answers
1k
views
How to teach using brackets in sums?
How one should teach using brackets in summation?
For example, why is it correct to write $\sum_i a_ib_i$ but $\sum_i a_i+b_i$ should be written as $\sum_i (a_i+b_i)$ But $\sum_i\frac{a_i+b_i}{2}$ is, ...
- 41
0
votes
1
answer
267
views
Which are the most used Greek letters in math textbooks?
I am looking for a list of the most frequent Greek letters used in high school and college textbooks or some other corpora. I've realized my students don't know Greek letters and I would like to teach ...
- 2,384
8
votes
5
answers
418
views
Should one include the unit in the variable? E.g. should one write $x^\circ = 30^\circ$ or $x = 30^\circ$?
I sometimes come across equations like
$x^\circ = 180^\circ - \frac{360^\circ}{n}$
where I would write
$x = 180^\circ - \frac{360^\circ}{n}$,
or like
$3 \text{ cm} + x \text{ cm} = 5 \text{ cm}$
where ...
- 1,881
2
votes
2
answers
246
views
How to introduce the use of Greek letters in high school?
I am looking for any hints or experience reports or materials/potential difficulties about how to introduce the use of Greek letters in high school Math/Physics.
- 2,384
4
votes
0
answers
127
views
What should I do when I, as a math tutor, use incorrect verbal notation?
I do freelance tutoring; the math-related ones are mostly 1-2 hour one-on-one sessions for high school and college students taking calculus classes. Often I find myself scrambling for words - I don't ...
- 377
10
votes
5
answers
2k
views
Lowercase vs. uppercase letters for matrix entries
For a matrix $A$ in, say for instance, $\mathbb{R}^{m \times n}$, there are at least two different conventions to denote its entry at position $(j,k)$:
Denote the entry as $a_{jk}$.
Denote the entry ...
- 2,325
8
votes
0
answers
189
views
References for mathematical notation for foreign students in the U.S
I teach quite a few foreign students at a U.S. university. Frequently students are placed in our most remedial math class due to not having placement scores and failing to test out of the course.
I ...
- 301
15
votes
4
answers
2k
views
Why do we use functional composition in the order we do?
Function composition means, roughly, taking the output of a function and applying it to the input of another function. If we define an object C to represent this operation, we could say $C(f,g) = f∘g$ ...
- 383
1
vote
1
answer
349
views
Limit from both sides or from left? [closed]
Is it possible to write a problem statement as follows:
A function $f$ is defined on $]0,1[$ as $f(x)=x$. Determine $\lim_{x\to 1}f(x)$.
Or should one write always as:
A function $f$ is defined on $]0,...
- 21
6
votes
2
answers
365
views
Effective Strategies for Helping Students Recognize Nonsensical Expressions? (HS - Undergrad Level)
I'm not entirely how best to pose this question, so that it fits within the guidelines (so edits / suggestions for modification are warmly welcome).
I'm interested in exploring effective strategies ...
- 229
5
votes
3
answers
375
views
What's a good notation to show elements of relation composition?
Teaching discrete mathematics, we pose (from the textbook) questions on finding compositions of relations, notably, relations on very small finite sets with only 3 or 4 elements (as an introductory ...
- 26.6k
7
votes
6
answers
2k
views
Why do we write $x$ instead of $1x$?
I am currently student teaching for an Integrated Math 1 class (which is similar to Algebra 1) that consists of 9th graders. I have been teaching my students how to solve linear systems using ...
- 1,289
7
votes
7
answers
4k
views
What is the preferred way to denote the Pythagorean theorem equation?
I am teaching 12-16 year olds.
How should I write down the Pythagorean theorem equation?
Some alternatives:
$a^2 + b^2 = c^2$
$\text{leg}^2 + \text{leg}^2 = \text{hypotenuse}^2$
$\text{leg}_1^2 + \...
- 1,881
4
votes
7
answers
351
views
Should I avoid writing: $ 11:40 - 15 \text{ min} = 11:25$, and what are alternatives to this way of writing?
I want to stress to my students that we should be careful with how we treat the equals sign and that we should always make sure that the units match. However, sometimes I write
$
11:40 - 15 \text{ min}...
- 1,881
25
votes
11
answers
6k
views
Why do we still teach the determinant formula for cross product? And is it as bad as I think it is?
The cross product is an important vector operation in in any serious multivariable calculus course. In most textbooks that I'm aware of, right after the definition, we always introduce the ...
user13395
9
votes
2
answers
411
views
Question about function notation
In the textbook I am using to teach mathematics to high school students I found the following illustration about composition of functions.
I do not agree with this illustration. For me $g$ is the ...
- 1,258
11
votes
6
answers
2k
views
What is the right notation to use in multivariable chain rules?
The following "chain rule" is in my multivariable calculus course:
If $f$ depends on $x$ and $y$, but $x$ and $y$ depend on $t$, then $\frac{df}{dt} = \frac{\partial f}{\partial x} \frac{d ...
- 21.8k
9
votes
2
answers
636
views
Fear of notation and hazily-appeared writing in Mathematics
I am looking for literature related to fear of notation in mathematics.
It is even heard that the font size and font type make a reader reluctant to study mathematical literature, often lecture notes,...
14
votes
2
answers
2k
views
The use of "$\therefore$" and "$\because$"
In schools, many students learn the usage of "$\therefore$" and "$\because$" in proofs. Such three-dot notation are popular in many high-school books and exams, but are almost ...
- 1,673
1
vote
1
answer
241
views
What to call a symbol that denotes an "undisclosed" given number? [closed]
Students like to categorize notations to pin down their understanding of exactly what these notations stand for. Thus, given the expressions $f(x_{0})=f(x)|_{x\leftarrow x_{0}}$, $x=x_0+h$, or $lim_{x\...
- 874
4
votes
3
answers
442
views
Students writing $f(x^2+1)$ when they probably mean $f(x)=x^2+1$
Over the past years teaching freshmen calculus I've repeatedly seen students make the following type of error:
Suppose they have to express some quantity $y$ as function of $x$, when the relation ...
- 2,038
5
votes
2
answers
331
views
Undergraduate Vector Calculus Notation Mess
Question 1: What are your arguments in favor of the big array of different notations used in the context of undergraduate vector calculus: line integrals, surface integrals (of scalars and fields), ...
- 153
32
votes
6
answers
3k
views
Allowing nonstandard mathematical language and/or notation
How important is enforcing standard mathematical language and/or notation?
Today, I was questioned by a writing instructor as to how vital it is to correct students when they explain something using ...
- 9,719
11
votes
3
answers
685
views
Terminology for parts of limit notation
When we talk about: $$\lim_{x\to{c}}f(x)=L.$$ Is there a formal name for the number "$c$"?
I know that the notation means "$L$ is the limit of $f(x)$ as $x$ approaches $c$". It ...
- 379
6
votes
1
answer
200
views
Notation in the definition of matrix multiplication
When matrix multiplication is introduced, it is usually introduced with an additional variable: Given two multiplicable matrices $A$, $B$, one defines the product $C=AB$ to be the matrix given by some ...
- 161
6
votes
3
answers
278
views
Are there standard notations for 'number talks' / ‘math talks?'
I’m a homeschool teacher of a nine-year-old, and we sometimes have one-on-one ‘number talks’ (a.k.a. 'math talks') similar to the activity used in primary school classrooms.
Part of this process ...
- 329
27
votes
6
answers
11k
views
Should we stop differentiating between ln and log?
In many U.S. middle schools and high schools, $\ln$ and $\log$ are treated differently, with the intent that $\log$ is equivalent to $\log_{10}$. However, in undergraduate courses and in the academic ...
- 403
2
votes
2
answers
258
views
How should one approach the concept of "plus or minus", such as in the numerator of the quadratic formula?
The numerator is structured like:
$$(-b)\pm\sqrt{b^2- 4ac}.$$
Is it confusing or acceptable to distinguish between the following two things?
An idiom; and
What is or seems to be a compositionally ...
- 352
7
votes
5
answers
2k
views
Teaching asymptotic notations at the beginning of calculus [duplicate]
I'm thinking about teaching calculus by firstly introducing the asymptotic notations (big-Oh, little-oh, and $\sim$), secondly explaining their "arithmetic" (things like how to sum little-oh's and ...
- 569
7
votes
4
answers
447
views
The word "numeral", is it being taught and does the word exist for it in your language?
I am a mathematics educator from Lithuania and I have recently realized that there is no separate word in our language for the word "numeral". To be more precise there is no term to describe the ...
- 87
12
votes
5
answers
2k
views
A different symbol for the indefinite integral/antiderivative?
Examples. An indefinite integral (or antiderivative) of $\cos$ is $\sin$:
$$\int \cos = \sin.$$
Edit: There has been much unexpected confusion with the above statement. I define the above statement ...
user12641
45
votes
21
answers
7k
views
How to help new students accept function notation
I am struggling to help some of my new precalculus students accept function notation -- something new to them this term. I am looking for strategies to help them adopt this new notation.
Their main ...
- 9,719
3
votes
1
answer
179
views
Naming arbitrary constants: subscripts, primes, or just more letters?
When choosing names for arbitrary constants either during a lesson or while working with a single student, should one use$\{n_1,n_2,n_3,\dotsc\}$ or $\{n, n', n'', \dotsc\}$ or $\{a,b,c,\dotsc\}$? Is ...
- 4,855
5
votes
1
answer
307
views
What is the notation for polynomial long division in Norway?
I will be teaching a calculus-type course in Norwegian. Our textbook is unfortunately in English (the curse of a small language), but any custom exercises should be and all exams have to be in ...
- 7,463
12
votes
4
answers
4k
views
Notation for change of basis matrix
As far as I can tell, it's only a slight exaggeration to say that every text has a different notation for a change of basis matrix from (say) $\mathcal{B}$ to $\mathcal{C}$. That's not even to talk ...
- 5,996
11
votes
3
answers
532
views
Are there any negative consequences in applying operations/functions to a whole equality?
Some of my students solve equations not by applying the same operations on the left and right sides of an equation, but by applying the operation to the whole equality. For example, they may write ...
- 1,488