A Textbook of Logic (5th Revised edition)

A Textbook of Logic (5th Revised edition)

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Item Code: NAE531
Author: Krishna Jain
Publisher: D. K. Printworld Pvt. Ltd.
Language: English
Edition: 2014
ISBN: 9788124606483
Pages: 394
Cover: Paperback
Other Details 8.5 inch X 5.5 inch
Weight 490 gm
About The Book

The present book is the fourth enlarged edition of the earlier book A Textbook of Logic — An Introduction. The current edition includes an additional chapter on Uses of Language and its Functions. Like the earlier book, the present book sets forth the principles and procedures of elementary Logic in the most simplified way and is specifically designed and intended for the use of undergraduate students. It contains almost all the main topics on Deductive, Inductive and Symbolic Logic prescribed in the syllabi of different universities in the country.

The book attempts to present a clear perspective on Logic as a science of correct reasoning. In the introductory chapter the aim of Logic and the task of a Logician are elaborated. Other topics covered here are Terms, Propositions, Immediate Inference, Syllogism, Boolean Equations, Venn Diagrams, Anti-Logism Theorem, Truth Functions, Truth Table, Deductive Method, Predicate Calculus, Scientific Inductions, Causation, Mill’s Methods and Informal Fallacies to mention a few. All the topics are explained with the help of diagrams and lucid examples. Each chapter is followed by plenty of exercises for the benefit of students.

About The Author

Dr (Mrs.) Krishna Jain obtained her Masters Degree and PhD in Philosophy from Delhi University. She has been teaching Logic to the undergraduates for nearly the last three decades and is presently Reader in the Department of Philosophy, Janki Devi Memorial College, University of Delhi. Her other publications include Description in Philosophy — with Special Reference to Husserl and Wittgenstein (1994). 2007, Fourth revised and enlarged edition, xv, .348 p.; Bibliography; 22cm.

Preface To Fourth Edition

This fourth edition is yet another revised and enlarged edition of the earlier A Text book of Logic — An Introduction. Since incorrect use of language is one of the reasons for fallacious reasoning it is necessary for a student to understand the use of right language in the formulation and evaluation of arguments. Therefore, a new chapter on “Uses and Functions of Language” has been included in the present edition.

I am thankful to my colleagues Dr Sneh Khosla, Dr Rajib Ray Dr Raj Verma Sinha and Mansi Gupta for their help in many ways. I am equally thankful to Shri Susheel Kumar Mittal of the D.K. Printworld, Delhi for his keenness and personal interest shown in publishing this edition of the book.

Preface To The Third Edition

This is another revised edition of the earlier A Textbook of Logic – An Introduction (Revised and Enlarged Edition). Two new chapters, “Formal Proof of Validity” and Predicate Calculus”, have been added. Plenty of exercises have been given for the students to practice.

Preface To The Second Edition

This is an enlarged and revised edition of the earlier A Textbook of Logic — An Introduction. It contains, besides a new chapter n “Laws of Thought”, many fresh exercises. I am confident that his new edition will serve the interest of the students better.

I am extremely grateful to my numerous friends, colleagues and students for their valuable and constructive suggestions and comments on the earlier edition of the text.

Preface To The First Edition

The present book is the outcome of an interaction with students over a long period of time and proposes to explain the principles and procedures of Elementary Logic in the simplest possible way. It is an attempt to introduce students to both traditional as well as Symbolic Logic. It also covers Inductive Logic and includes Informal Fallacies committed in everyday arguments.

Almost all the topics are explained with the help of lucid examples. They also carry plenty of exercises for a better grasp of the subject. Special attempts have been made to clarify basic concepts such as Validity, Reasoning, Types of Reasoning, Proposition, Term, etc. In modern logic, Existential Import, Boolean Alzebra, Venn Diagrams, Truth Table, Shorter Truth Table Method are explained in a simple and easy language. A special chapter is provided for “translating” ordinary language sentences into symbolism of modern logic.

I shall like to express my gratitude to Prof. V.K. Bhardwaj, Deptt. of Philosophy, Delhi University, who went through the first draft of the text and offered many valuable suggestions. I am also thankful to Shri Balwant of Ajanta Books International for his keen interest in publishing the book. Last but not the least my thanks are due to my husband Dr V.K. Jam for encouraging me to write the present text.


Logic is a science of reasoning. The aim of logic is to provide methods, techniques and devices which help in differentiating right reasoning from wrong, and good reasoning from bad. But it does not mean that only those who study logic can reason correctly. However, it is true that those who study logic certainly make less errors while arguing. Just as a trained athlete is a better player than an untrained one, similarly a person acquainted with logical principles is likely to put forth good arguments. Knowledge of logic helps one to face a problem in a more orderly and systematic way, and in many cases makes the solution less difficult but more certain.

Science means a branch of coherently organized body of knowledge. Since logic is the study of consistent reasoning, it is certainly a science. Through logic we can judge, for example, whether a piece of reasoning such as we find in newspapers, magazines, etc. is correct or not, and also whether the conclusion follows correctly from the given evidences. Correct reasoning ns to discover the right order between the evidences and conclusion. There is order and sequence in our reasoning. The moment one is concerned with the idea that one thought follows from another, he is being logical. Correct and consistent reasoning means conclusion follows from the evidences or the premisses. In other words, correct reasoning means the premisses are strong enough to support the conclusion, and when the premisses are insufficient or inadequate to support the conclusion then the reasoning becomes incorrect.

Correct reasoning is the basis of all sciences, natural as well as social. In this sense it is very true to say that logic is presupposed by all sciences, and hence, it becomes a basic and primary science; a science of sciences.

But the logicians are not interested merely in the study of methods or techniques of differentiating right reasoning from wrong; it is equally important for them to acquire skill to apply these methods in determining the correctness of everyday reasoning and discourse as well. How efficiently or how skillfully one makes use of these methods in practical life is nothing but demonstrating the artistic aptitude. All arts are concerned with “doing” and “making”. Anyone who knows logic “does” good reasoning and “makes” sound arguments. He makes good definitions and good debates. Logic prepares a man to make right reasoning and right decisions. “Practice makes a man prefect” is true for all arts, and it is equally true for logic as well.


Preface to the Fourth Editionv
Preface to the Third Editionvi
Preface to the Second Editionvii
Preface To the First Editionviii
Part I
Subject Matter Of Logic3
From And Matter9
Truth And Validity11
Deduction And Induction15
2Function and Uses of Language21
Language Makes Thinking Possible21
Various Functions Of Language22
3Section A - Proposition: Traditional Account28
Traditional Classification Of Propositions29
Categorical Propositions30
Reduction Of The Sentences Into Standard Logical Form Propositions33
Exercise 139
3Section B - Modern Logicians' Treatment of Categorical Propositions41
Existential Import41
Boolean Analysis Of Categorical Propositions44
John Venn's Diagrams45
Exercise 250
Modern Classification Of Propositions50
Categorical Propositions51
Modern Classification Of Propositions53
Distribution Of Terms55
Denotation And Connotation Of Terms58
Types Of Terms62
Contradictory Terms66
Contrary Terms66
5Square Of Opposition67
Modern Logicians "Square Of Opposition"72
Exercise 374
6Immediate Inference76
Immediate Inference (Eduction) In Modern Logic89
Exercise 491
7Section A - Categorical Syllogism94
Figures Of Syllogism95
Moods Of Syllogism96
Standard Form Categorical Syllogism96
Exercise 598
Exercise 6100
7Section B - Validity Of Categorical Syllogism: Traditional Methods102
Rules Related To Distribution Of Terms103
Rules Of Quality105
Rule Of Quantity106
Special Rules Of 1st Figure110
Special Rules Of 2nd Figure112
Special Rules Of 3rd Figure113
Special Rules Of 4th Figure114
Exercise 7117
7Section C - Validity of Categorical Syllagism 120 by Modern Method120
Exercise 8130
The Antilogism130
Exercise 9136
7Section D - Non-Categorical Syllogism137
Disjunctive Syllogism138
Hypothetical Syllogism139
Exercise 10143
8Laws of Thought145
Part II
9Symbolic Logic : Its Nature and Character153
Logical Form And Validity Of An Argument155
Advantages Of Using Symbols156
Inference And Implication158
Symbolization Of Compound Propositions162
Exercise 11169
11Truth Function176
Negative Function177
Conjunctive Function178
Disjunctive Function180
Alternative Function183
Implicative Function184
Paradox Of Material Implication186
Equivalent Function188
Interdefinability Of Truth Functions (Constants)189
Stroke Function191
Exercise 12193
12Truth Table Method as Decision Procedure197
Truth Table Method197
Illustrated Statement Forms202
Exercise 13205
Testing The Validity/Invalidity Of The Argument208
Exercise 14213
13Shorter Truth Table Method (Reductio ad Absurdum or Indirect Method216
Exercise 15221
14Formal Proof of Validity226
Modus Ponens (M.P)227
Modus Tollens (M.T)228
Disjunctive Syllogism (D.S)229
Hypothetical Syllogism (H.S)231
Constructive Dilemma (C.D)232
Conjunction (CONJ.)234
Simplification (SIMP)234
Addition (ADD)235
Absorption (ABS)235
Exercise 16238
15Section A - Predicate Calculus244
Singular Propositions249
Exercise 17253
15Section B - Validity261
Exercise 18264
15Section C - Invalidity268
Exercise 19270
Part III
Types Of Induction281
Plurality Theory Of Causation295
18J.S. Mill's Experimental Methods298
Method Of Agreement299
Method Of Difference (Disagreement)303
Joint Method Of Agreement And Difference305
Method Of Residues307
Method Of Concomitant Variation308
Assessment Of The Methods310
Conditions Of Valid Hypothesis315
Crucial Instances322
Part IV
20Informal Fallacies325
Formal Fallacies325
Informal Fallacies325
Select Bibliography347
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