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12 Subscripts Etc       Back ] Home ] Up ] Next ]

Chapter 12
Shorthand Usage Guide

Previous Section: 12 Big and Small Letters


5  Subscripts Etc 
why subscripts appear

When we start to run out of symbols or imagination for our shorthand, we can always use subscripts (usually whole numbers, letters or words) on our symbols. Subscripts mean more writing, but they give more (compound) symbols to employ as shorthand for quantities. For instance, suppose we have a list of say five numbers. The first number on the list could be denoted by x1, the second number on the list could be represented by x2, the third number on this list could be indicated by x3, the fourth number on this could be designated by x4, the fifth number on this list could be symbolized by x5. More subscripts could be used as needed. Here are some more examples.

Number or Quantity Symbolic Shorthand
The age of my house Ahouse
The floor area of my apartment A
The area of a football field A2
The amount of money you will give me AIOU
The time remaining before this class finishes Tquit or T1
The fourth number picked from a hat N4
The amount of milk in a cereal bowl M1 or Amilk or ....
 

The choice of shorthand is often a matter of taste. Tastes do differ.


Chapter Sections:  12 Symbols & Pronouns ] 12 Pronouns ] 12 Shorthand Usage Guide ] 12 Pronouns in Mathematics ] 12  Big and Small Letters ] [ 12  Subscripts Etc ] 12 An Exercise ] 12 Symbols & Numbers ] 12  Offspring Naming Conventions ] 12  A Review & Answers to Exercise ]

Next Section: 12 An Exercise

Next Chapter: 13 What's Next

 

Three Skills
For 
Algebra

understanding & explaining
Reason and Math
Volume 2
Printed in Canada
ISBN 0-9697564-2-9

Chapters and Appendices

Home
Postscript: The 4-th Skill For Algebra
Foreword
1. Introduction
2. Implication Rules
3. Chains of Reason
4. Romeo and Juliet
4. Induction Mathematical
5 Knowledge Islands
6  Old Language
7  Arith Skill Check
7. The Next Chapters
8 The Three Skills
8 VNR-Concise-Encyclopedia
PS. What is a Variable
9. Algebra Talk
10 Two More Skills
11 Why Shorthand
12 Shorthand Usage
13 What's Next
14 Compound Interest
15 Linear Equations
PS I.  Distributive Law
PS II. Polynomials
16 Painless Proofs
17 Pythagoras
18 Rules of Algebra
19  Functions & Sets
20 Degrees & Radians
21 What's Next
22. Arith & Geometric Sums
23 Summation Notation
24 Your Money
25 Induction & Recursion
26 What's Next
27 Pronouns in Logic
28 Occurrence Tables
29 Contrapositive
30 Truth Tables
31 Indirect Reason
A. Advice For Learning

Words Before Symbols: 
What is a Variable?
Introduction
Variation between Examples

Variation of Letters

A letter denotes a variable

Cases of Double Variation

Three Notions of a Variable

Constants, Parameters
& Variables

Talking about numbers
Dependent or Independent
Variable, a Matter of Choice


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