Employ an online or offline tutor at your own risk from
AU:
tutorfinder.com.au
CDN : findatutor.ca
CDN: .i-tutor.ca
CDN: Montreal Tutors
NZ: findatutor.co.nz
UK: tutorhunt.com
UK: tutors4me.co.uk
USA: wiziq.com
USA: ziizoo.com
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YOU are better than YOU think. Show yourself how:
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Logic
Mastery
Amazing, Amusing, Amorous, Delicious, Delightful, Edifying,
Strengthening Elixir.
It eases work & learning difficulties Makes the hard easier. Opens eyes.
Leads to greater precision.
in reading and
writing
Do not leave here without it - Logic
mastery will develops critical thinking, improve reading and writing,
and give a firmer base for work and studies at many levels. Good luck.
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Caution: Site advice is approximately
correct, for some circumstances, not all. Site How-TOs are logically
developed, but not tried and tested. That leaves room for thought and
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After logic,
(a) continue reading Three
Skills for Algebra, chapters 8 to 14 and do so alongside site area on solving
linear2007 Equations ; or (b) see this calculus
starter lesson and Volume 3, Why
Slopes & More Math, chapters 2 to 6;
For online automated help in senior high school maths & calculus,
visit quickmath.com For Automatic
Calculus and Algebra Help with derivatives, integrals, graphs, linear equations,
matrix algebra, visit calc101.com
With overlap, each site quickmath
& calc101offers a different range of
services, some free, some not, all based on webmathematica. Good luck.
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Explore collaborative whiteboards from
groupboard, twiddla or
scriblink.
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The Second Puzzle
Previous: The First Puzzle
A Two-Way Implication Rule
Try answering the five questions again, using this two-way (implication) rule
Tom goes out to play when and only when Aunt Jane visits his home.
instead of the original rule. How will the answers change? Rather, which
answers change? This second rule can be restated as follows.
Tom goes out to play when Aunt Jane visits his home.
and also
Tom goes out to play only when Aunt Jane visits his home.
The first when part of this rule is disobeyed in the situation where
Aunt Jane visits and Tom does not go out to play. The only when part of this
rule is disobeyed in the situation when Tom goes out to play without his Aunt
Jane visiting. Here are the five questions again.
- When the rule is obeyed, what can you say happens for sure when Aunt Jane
visits her nephew's home? This is easy. [Answer]
- When the rule is not disobeyed, what can you say happens for sure about
Aunt Jane when Tom is out playing? Be careful. [Answer]
- When the rule is not disobeyed, what can you say happens for sure about
Tom when Aunt Jane is not visiting? Be careful, again. [Answer]
- What must happen for the given rule to be disobeyed? This is another
easy question. [Answer]
- When the rule is not disobeyed, what can you say for sure about Aunt Jane
when Tom does not go out to play? See the answer to the fourth question. [Answer]
Answers are given twice
- in popup boxes, and
- in text below. (as in
the printed version)
See if you agree with them.2 |
The two-way implication rule for the second puzzle is:
Tom goes out to play when and only when Aunt Jane visits his home
instead of the original rule. How will the answers change? Rather, which answers
change? This second rule can be restated as follows.
Tom goes out to play when Aunt Jane visits his home
and also
Tom goes out to play only when Aunt Jane visits his home.
The first when part of this rule is disobeyed in the
situation where Aunt Jane visits and Tom does not go out to play. The only
when part of this rule is disobeyed in the situation when Tom goes out to
play without his Aunt Jane visiting. The questions and answers follow.
- When the rule is obeyed, what can you say happens for sure when Aunt Jane
visits her nephew's home? Answer: Tom must be out playing (no change).
- When the rule is not disobeyed, what can you say happens for sure about
Aunt Jane when Tom is out playing? Answer: Aunt Jane must be visiting (the
answer has changed).
- When the rule is not disobeyed, what can you say happens for sure about
Tom when Aunt Jane is not visiting? Answer: Tom is not outside playing (the
answer has changed).
- What must happen for the given rule to be disobeyed? Answer: Either Aunt
Jane must be visiting and Tom does not go out to play or Tom must be out
playing without Aunt Jane visiting (the answer has changed).
- When the rule is not disobeyed, what can you say happens for sure about
Aunt Jane when Tom does not go out to play? Answer: Aunt Jane is not
visiting (no change).
Chapter Subsections: [ First Puzzle ] [ Second Puzzle ] [ One- Versus Two-Way ] [ Talking About Logic ] [ Implications vs Suggestions ] [ One Versus Two Way Committments ] [ Repeatable & Reproducible ] [ Limits and Benefits ] [ Accidental Rules ] [ Steps for Better Reason ]
Next: One- Versus Two-Way
Implications
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www.whyslopes.com
Volume 1A, Pattern Based Reason
Chapters 1 to 24
FOREWORD
Three Remarks
1 Introduction
2 Communication
3. Elements of Reason
4 Implication Rules
5. Deception
6 Chains of Reason
7 Longer Chains
For & From Consistency
8. Language Change
9 Next Chapters
10 Responsibility
11 Accidental Patterns
12 Knowledge Islands
13 Euclidean Logic
14 Deductive
& Empirical
Views of Mathematics
15 Objectivity
16 Origin of Rules
and Patterns
17 Objective Ways
18. Waking up
19. Symbols & Logic
20. Pronouns or Symbols
21. Truth Tables I.
22. Truth Tables II
22. Biconditional
22. Contrapositive
23. IF-THEN table
24. Indirect Reason Again
To reason often means to persuade someone of
the need for an idea or action. That someone could be yourself. So be
careful.
1A Logic Postscripts
- online only
+Proof by
Absurdity alias proof by contradiction
+How the demand
for consistency supports the law of the excluded middle
+Reality versus or with the aid of Imagination
+Links for reason, logic and crtical thinking
+Three Remarks
+History
Lost or Missing
There is a difference between
knowing how to spend money,
and having money to spend.
There is likewise a difference
between mastering a skill
and having meeting a situation in which it applies.
.
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