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Academics Hub: What Is Informal and Formal Logic? What Are The 4 Types of Logic ?

What Is Informal and Formal Logic? What Are The 4 Types of Logic?

The science of reasoning is sometimes referred to as logic. This does not imply that logic is an empirical science like physics, biology, or psychology, which are all experimental or observational fields of study. Rather, like mathematics, logic is a non-empirical discipline. Logic is a subject that is being studied in an academic institute. It has immense importance in students’ academic life. Since today’s business students will be tomorrow’s managers, critical and objective thinking will be the key to their success. Making varied business judgments requires distinguishing between sound and flawed reasoning, which is what logic is all about. In order to analyse the importance of logic as a subject in the business discipline, we have mentioned important things about logic, formal logic, informal logic and the four logic types.

Significance of Studying Logic for Students

The laws of logic define proper inference from facts to conclusions. In business, it is crucial to have faith in judgments made regarding important issues. We all utilise logic in our daily thinking. However, it’s common to reach incorrect conclusions when utilising flawed reasoning. Logic is used to debate and is in some way thought or idea that influences us for an action we take in our daily lives. It is also used to explain everyday wonders and to encourage man to investigate how everything around him works. Ongoing self-evaluation gives us a way to learn from new experiences.

Indeed! Understanding a subject’s concepts, structure, and methodology is necessary to master the subject. By emphasising concepts, conclusions, and arguments, logic instructs you on how to do this. If you study logic, you will better comprehend the structure of whatever discipline you choose to study. It will instruct you on how to identify and create precise definitions. You will learn how factors like argument and evidence weigh in when judging truth claims.

Many students choose this subject, but when it comes to making assignments on the subject matter, they find it hard to complete them. It requires ample time, dedication, and research to compose the assignments per your university professor’s expectations. Are you going through a similar phase? Worried about completing your logic assignments. No worries! Getting assignment help from professional homework help websites can save you from failure. By hiring an authentic and reliable website, you can get the philosophy logic homework help and secure your academic career well. Before we move further, let’s discuss formal logic and informal logic. Also, we will dig deeper into the four logic types later in this blog.

What Is Formal Logic?

Formal logic drives logical inferences from premises known or assumed to be true. There are various varieties of formal logic, and each one depends on different mechanisms for converting natural language claims into formal representations. Once the logic is expressed in formal language, it can be evaluated for accuracy and utilised to draw inferences. No logical framework can capture all the subtleties of natural language. Therefore, notions that are beyond the scope of formal logic can be evaluated by informal logic. Mathematicians and philosophers created the formal system of logic to establish guidelines for how to establish or refute claims. Furthermore, the goal of formal logic is to assist us in creating sound arguments (or proofs) and evaluating the soundness of others’ arguments (or proofs). Computer languages and digital circuitry are two more significant applications of formal logic. All computer software and electronic hardware are constructed using formal logic principles. Formal logic studies deductive argumentation systems using symbols to represent categorically defined phrases. Compare formal systems such as philosophical logic, which can be seen as representing a piece of natural argument.

Formal logic is considered traditional logic or philosophical logic. One expression (conclusion) is derived from one or more additional expressions using a formal system, often known as a logical calculus (premises). These presumptions could be theorems or axioms, the latter of which is taken for granted (derived using a fixed set of inference rules and axioms, without any additional assumptions).

Is Informal Logic the Same As Formal Logic?

The term “informal logic” refers to using logic and logical reasoning outside of a formal context. Informal logic is used to analyse and assess arguments in daily life. Most people consider informal logic an alternative to formal or mathematical reasoning. They are also referred to as critical thinking or informal logic. The study of logic has frequently encouraged the notion that its techniques might be applied to comprehend and enhance thinking, reasoning, and argument as they happen in situations that are relevant to everyday life, such as public discourse and debate, education and intellectual exchange, interpersonal interactions, law, medicine, and other professions. Building a logic appropriate for this goal is what informal logic attempts to do. It combines explanations of argument, evidence, proof, and justification with an instrumental perspective that emphasises their utility in the study of actual disputing.

Informal logic is an effort to create a system of logic that may be used to evaluate, analyse, and enhance every day (or “daily language”) thinking. It crosses paths with efforts to comprehend such thinking from the perspectives of formal logic, cognitive psychology, philosophy, and a variety of other fields. Moreover, most research in informal logic concentrates on the reasoning and argument (in the premise-conclusion sense) one encounters in interpersonal communication, advertising, political discourse, legal argument, and the social commentary that distinguishes newspapers, television, the Internet, and other forms of mass communication.

Type of Logic

The study of reasoning, also known as the study of the rules and standards of legitimate inference and evidence, is known as logic. The term “logic” has several meanings, including word, thought, idea, argument, account, reason, or principle. There are many types of logic, but here we are going to discuss four logic types. Formal and informal logic are the types of logic we have already discussed. So, from now on, we will discuss the other four logic types: informal and formal logic.

Symbolic Logic

The study of symbolic abstractions that embody the formal characteristics of logical inference is known as symbolic logic. It deals with the relationships between symbols and frequently employs intricate calculus to answer intractable issues that classical formal logic cannot address.

It frequently has two sub-branches:

  • Predicate Logic: A system in which formulas have quantifiable variables is known as predicate logic.
  • Propositional Logic: A system in which formulas representing propositions can be created by connecting atomic statements with logical connectives, sometimes known as sentential logic, enables the establishment of specific formulas as theorems. 

Mathematical Logic

The use of mathematical techniques for formal logic representation and analysis and the application of formal logic methods to mathematics and mathematical reasoning is being studied in this logic type. The Ancient Greeks, including Euclid, Plato, and Aristotle, were the first to apply geometry and mathematics in relation to logic and philosophy. Researchers believed that when human knowledge could be articulated using logic with mathematical notation, it would be possible to develop a machine that reasons (or artificial intelligence).

Inductive Logic

When using inductive reasoning, the premises of an argument are thought to support the conclusion but are not thought to guarantee it. This is done by deriving a trustworthy generalisation from observations (i.e., from the specific to the general). The soundness of those conclusions for which the evidence is not conclusive is what inductive logic is concerned with rather than validity or conclusiveness. Many philosophers have contested or denied the logical admissibility of inductive reasoning. Philosophers stated that the justification for inductive reasoning is circular since it requires inductive reasoning to reach the premises for the principle of inductive reasoning.

Deductive Logic

Deductive reasoning looks at what conclusions are necessary given the premises. If (and only if) there is no scenario in which all premises are true, but the conclusion is incorrect, the inference is deductively valid. But it should be kept in mind that an incorrect premise could result in a false conclusion. Aristotle, Thales, Pythagoras, and other Greek thinkers of the Classical Period invented deductive reasoning. The syllogism often referred to as the term logic and typically assigned to Aristotle, is the fundamental unit of deductive reasoning. It consists of three premises, each of which has one term in common with the conclusion, from which the conclusion can be derived.


This blog is aimed to provide information about logic and its types. Logic is a subject being studied by many students. The subject is vast and has immense significance for business students. This blog is helpful for students who have undertaken the subject and want to know about the logic types. Throughout this blog, we discussed formal logic and informal logic. Apart from these logic types, we also discussed other four types of logic: symbolic, mathematical, inductive, and deductive. College students often get stuck while doing logic assignments. In such a case, getting philosophy logic homework help from a professional assignment help website is the ideal choice.

About Alford Selim

Professor of Natural Religion, Moral Philosophy, and History of Philosophy. He is masters in Philosophy from Harvard University. His research interests are in Ethics and Epistemology. He is an academic writer by choice and loves to help young minds grow their concepts about philosophy. In philosophy, he is impressed by Plato Ideology.