AN
OUTLINE OF LOGIC AND LOGICAL SYSTEMS
ANIL
MITRA, COPYRIGHT © 2000, REFORMATTED June 2003
FORMAL
LOGIC AND THE VARIETY OF LOGICS
Categorical propositions; immediate inference; categorical syllogisms; other argument forms; symbolic logic; inductive logic
Propositional and Predicate Calculi – lower and higher-order predicate calculi
Modal Logic
Set Theory
Its Nature, Origins, and Influences
Syntax and semantics; the axiomatic method; logic and metalogic; semiotics – the study of signs and sign using behavior
Nature of a Formal System and of its Formal Language
Discoveries About Formal Mathematical Systems
Gödel’s two incompleteness theorems; decidability and undecidability; consistency proofs
Discoveries About Logical Calculi
Calculi of formal logic
Propositional calculus; the first-order predicate
calculus; Löwenheim-Skolem theorem – any system which can be formalized in the
first order predicate calculus, if it has a model, will have an enumerable
model; the completeness theorem; the undecidability theorem and reduction
classes
Model Theory
Is the branch of metalogic in which the interpretation of theories formalized in the framework of formal logic are studied
Background and typical problems
Satisfaction of a theory by a structure: finite and infinite models; elementary logic; non-elementary logic and future developments
Characterizations of the first-order logic;
generalizations and extensions of the Löwenheim-Skolem theorem; ultrafilters,
ultraproducts, and ultrapowers – constructs that are useful in studying models
The Critique of Forms of Reasoning
Correct and defective argument forms; kinds of fallacies - material, verbal and formal fallacies
Epistemic Logic
The logic of belief
Theory of belief
The logic of knowing; the logic of questions
Practical Logic
The theory of reasoning with concepts of practice—of
analyzing the logical relations among statements about actions and their
accompaniments in choosing, planning, commanding, permitting, and so on—this is
the domain of practical logic
The logic of preference – or the logic of choice, also known as proairetic logic
Symbolization and approach taken in proairetic logic; construction of a logic of preference
The logic of commands; deontic logic – the permitted, the obligatory, the forbidden, or the meritorious are the deontic modalities
The systematization and relation to alethic modal logic – what is commonly called modal logic, the modal logic or logics of truth [and falsehood]; alternative deontic systems
Logics of Physical Application
Temporal logic
Classic historical treatments; fundamental concepts and relations of temporal logic; systematization of temporal reasoning
Mereology – founded by Stanislaw Lesniewski, mereology clarifies class expressions and axiomatizes the relation between parts and wholes
Basic concepts and definitions; axiomatization of mereology
Computer Design and Programming
There is a clear connection between
two valued logics and the 0 / 1 binary elementary computer states. However the
details of computer design depend more on lattice theory than on logical
theory. There is, however, a strong connection between computer programming and
logical theory. Additionally, there is a connection between machine states and
the possible worlds used in the semantics of modal logic. This connection,
extended to include dynamic logic – the logic of dynamic or non-static
descriptions of the world, temporal logic and process logic – the logic or
argumentation that is applicable to all kinds of processes, has been used to
study the properties and behavior of computer programs – e.g., does a program
stop after a finite number of steps?
Hypothetical Reasoning and Counterfactual Conditionals
These have to do with what would obtain
if something that is not known to be true or known to be not true were true. I
have read that developments of the theory have various practical applications,
including science and history
One of the purposes of formalization is to abstract and make precise the kinds of informal
argumentation. In so doing, we get systems that are specialized, even
compartmentalized. The price of precision is that some of the variety and
interconnections are lost. At the same time formalization leads, in addition to
greater precision, to the study and extension of formal systems. Obviously,
care is needed in the selection of one or another formal system to a particular
situation. While some logical systems have been constructed out of or as
curiosities, the origin of formal logic is in the desire to make explicit and
analyze the structures of inference
The purposes of study of logic and of the variety,
here, are as follows. First, out of
interest in the analysis of, the need for and the application of the various
forms. Second, to consider what structural unities there may be among the
various logics; is there a single logic from which all may be derived? Third,
in an attempt to formulate a theory of logic: what is logic, what is its
relationship to knowledge and the knowledge process, is there a single logic or
concept of logic from which all the foregoing follow, and, finally, is there a
Logic and, if so, what is its relation to logic?
How will such a logic or Logic be “generated?” The bases will include:
The kinds of category: substance, space, time, cause, part-whole…
The kinds of knowledge: body, iconic, linguistic – these correspond roughly to immersion, acquaintance and description
The kinds of speech act: assertive, directive, commissive, expressive and declarative
Variety of practical application
Unifying and differentiating principles applied to the foregoing
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