Argument
A set of sentences such that one sentence (the conclusion) follows necessarily from the other sentences (the premises)
Premise
A statement regarding what is the case (taken as fact)
Syllogism
A brief form for stating an argument that consists of two statements and a conclusion that must be true if these two statements are true.
Enthymeme
An argument with a suppressed premise (unmentioned but argument is still understandable and generally agreeable without it)
Deductive Argument
The conclusion is no broader than its premises; the conclusion is confined in its premises (Non-Ampliative)
Inductive Argument
The conclusion is broader than premises (Ampliative)
Ampliative
Serving to extend what is already known
Valid Argument
The conclusions follows from the premises
Well-grounded argument
Based on accurate premises
Sound Argument
Are valid and well-grounded
Logical Fallacy
An identifiable category of argument that does not support its conclusion
Circular Argument
The conclusion is identical to the premise
Begging the question
One has to accept the conclusion to accept one of the premises
Ad hominem
Attacking your interlocutor’s character or personal traits in an attempt to undermine their argument
Appeal to Authority
Claiming that because an authority figure thinks something, then it must be the case
Strawman Fallacy
To interpret someone’s position in an unfairly weak way, and so argue agains a position that nobody holds, or is likely to hold
Genetic Fallacy
Judging a claim/argument based on where it comes from
Black or White Fallacy/False dilemma
Considering two alternative states as the only possibilities, when in fact more possibilities exist
Middle Ground Fallacy
Presuming that a compromise, or middle ground, between two extremes must be the truth
Anecdotal Fallacy
Idea that we can use an experience or story in place of a sound argument or compelling evidence
Appeal to Nature
Presuming that because something is ‘natural’ it is therefore justified, inevitable, good, or ideal