Handwave

	Cogito ergo sum; Logic and rhetoric
	Key articles
	Logical fallacy; Syllogism; Argument;
	General logic
	Confusion of the inverse; Triviality; Occam's razor; Fuzzy logic; Truth table; گزاره‌ی صاحب‌نظر;
	Bad logic
	One single proof; Fallacy of ambiguity; Pathos gambit; Affirming a disjunct; Conspiracy theory; Viés de seleção; v - t - e

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Handwaving is the act of glossing over a difficult or superfluous component in an argument, by ignoring or distracting from it, and hence treating it as a black box for the purpose of a discussion. It is a metaphor derived from the sleight-of-hand of a conjuror who relies on flamboyant hand movements to distract the audience.^[1]

The assumption is that the component in question is either outside the scope of the current discussion or simply doesn't need to be understood by the listener; as a result, while there may be legitimate reasons not to bother with the handwaved topic, handwaving can sometimes be used as a form of misdirection or outright bullshit in order to advance a faulty argument. The term is used in mathematical contexts where important steps are left out so that something is assumed to be true without any rigorous demonstration, which can lead to things being assumed to be true that are in fact unproven and false. In literary or film criticism, it refers to a technique where an author ignores a plot hole and hopes the audience won't notice or tries to get around a plot hole by distraction.^[1]

Examples[edit]

What we are really interested in...[edit]

Woo-defender: Magnet therapy has been proven to work in so many cases.
Scientist: Well-designed clinical testing has shown no correlation between the use of magnetic therapy and any improvement in health.
Woo-defender: Clinical trials may be fun to chat about, but we are talking about the thousands of real-life successes here. There are millions of them. It is the billions of real-life cases of success with magnetic therapy in real-life magneto-medicine that we are interested in.

"Just a theory" gambit[edit]

Creationist: As we can see, if evolution really worked, then pilots who fly a lot would have grown wings by now.
Scientist: That's not how evolution works. Evolution is based on natural selection from traits over time. As humans, we don't have any sort of gene that allows us to fly, since we don't need to. We can't even grow our own wings at will. It's not genetic at all. Unless a flood covers the Earth and we're forced to live above ground, then maybe, over hundreds or thousands of generations of natural selection, we may sprout wings.
Creationist: That mumbo-jumbo is just a theory. Show me a pilot with feathered wings!

Skinner constant[edit]

Skinner’s Constant (also known as Flannegan's Finagling Factor) denotes:

“”That quantity which, when multiplied by, divided into, added to, or subtracted from the answer you got, gives you the answer you should have gotten.

There's a great many ideas that would work, if just one important item wasn't completely unknown. For such things, we have the Skinner constant — the mathematical equivalent of a handwave.

Left as an exercise[edit]

Usually, the term "left as an exercise" (originated in and largely used in mathematical and computer science circles) implies that part of a proof or algorithm is sufficiently elementary as to be either obvious or readily worked out by the reader or student. However, it can be used in two less-than-sensible ways:

As a potholed introduction to an exceptionally difficult or unsolved problem
As part of an argument by intimidation

External links[edit]

The canonical definition at the Jargon File

References[edit]

↑ ^1.0 ^1.1 See the Wikipedia article on Hand-waving.

[wp-1] 1.0 ^1.1 See the Wikipedia article on Hand-waving.

v - t - e Articles about logical fallacies
Informal fallacies:			Appeal to tradition • Appeal to novelty • Appeal to nature • Argument from morality • Argumentum ad martyrdom • Big words • Certum est quia impossibile est • Morton's fork • Friend argument • Exception that proves the rule • Extended analogy • Hindsight bias • Race card • Moralistic fallacy • Release the data • Gish Gallop • Terrorism-baiting • Uncertainty tactic • Greece-baiting • Ham Hightail • Red-baiting • Gore's Law • Nazi analogies • Mistaking the map for the territory • Red herring • Quidquid latine dictum sit, altum videtur • Presentism • Sunk cost • Two wrongs make a right • Flying carpet fallacy • My enemy's enemy • Appeal to ancient wisdom • Danth's Law • Argumentum ad lunam • Balance fallacy • Golden hammer • Loaded question • Escape to the future • Word magic • Spider-Man fallacy • Sanctioning the devil • Appeal to mystery • Informal fallacy • Common sense • Post-designation • Hyperbole • Relativist fallacy • Due diligence • Straw man • Good old days • Appeal to probability • Infinite regress • Circular reasoning • Media was wrong before • Is–ought problem • Ad iram • Just asking questions • Pink-baiting • Appeal to faith • Appeal to fear • Appeal to bias • Appeal to confidence • Appeal to consequences • Appeal to emotion • Appeal to flattery • Appeal to gravity • Appeal to hate • Argument from omniscience • Argument from silence • Argumentum ad baculum • Argumentum ad fastidium • Association fallacy • Broken window fallacy • Category mistake • Confounding factor • Counterfactual fallacy • Courtier's Reply • Damning with faint praise • Definitional fallacies • Equivocation • Fallacy of accent • Fallacy of accident • Fallacy of amphiboly • Gambler's fallacy • Imprecision fallacy • Moving the goalposts • Nirvana fallacy • Overprecision • Pathos gambit • Pragmatic fallacy • Quote mining • Argumentum ad sarcina inserta • Science doesn't know everything • Slothful induction • Spotlight fallacy • Style over substance • Toupee fallacy • Genuine but insignificant cause • Argument from incredulity • Appeal to age • Argumentum ad nauseam • Phantom distinction • Appeal to common sense • Argumentum ad hysteria • Omnipotence paradox • Argument from etymology • Appeal to trauma • Countless counterfeits fallacy •
	Ad hoc:		No True Scotsman • Moving the goalposts • Escape hatch • Special pleading • Slothful induction • Nirvana fallacy • God of the gaps • PIDOOMA • Ad hoc • Tone argument •
	Arguments from ignorance:		Science doesn't know everything • Argument from incredulity • Argument from silence • Toupee fallacy • Appeal to censorship • Science was wrong before • Holmesian fallacy • Argument from omniscience • Willful ignorance • Argument from ignorance •
	Causation fallacies:		Post hoc, ergo propter hoc • Correlation does not imply causation • Wrong direction • Counterfactual fallacy • Regression fallacy • Gambler's fallacy • Denying the antecedent • Genuine but insignificant cause •
	Circular reasoning:		Infinite regress • Argument by assertion • Argumentum ad dictionarium • Appeal to faith • Circular reasoning • Self-refuting idea •
	Emotional appeals:		Appeal to fear • Appeal to emotion • Appeal to confidence • Deepity • Argumentum ad baculum • Appeal to shame • Appeal to flattery • Tone argument • Appeal to money • Argumentum ad fastidium • Appeal to gravity • Appeal to consequences • Loaded language • Style over substance • Appeal to pity • Appeal to hate • Pathos gambit • Shaming • Degenerate • Abomination •
	Fallacies of ambiguity:		Fallacy of accent • Equivocation • Fallacy of amphiboly • Quote mining • Fallacy of ambiguity • Moral equivalence • Scope fallacy • Suppressed correlative • Not as bad as • Etymology • Continuum fallacy • Wronger than wrong • Definitional fallacies • Code word • Phantom distinction •
Formal fallacies:			Confusion of the inverse • Denying the antecedent • Non sequitur • Affirmative conclusion from a negative premise • Not even wrong • Chewbacca Defense • Affirming a disjunct • Illicit process • Four-term fallacy • Negative conclusion from affirmative premises • Fallacy fallacy • Substituting explanation for premise • Enthymeme • Syllogism • Formal fallacy • Existential assumption • Masked man fallacy • Self-refuting idea • Argument by gibberish • One single proof • Affirming the consequent • False dilemma • Conjunction fallacy •
Fallacious arguments:			Bumblebee argument • Fatwa envy • Gotcha argument • Hoyle's fallacy • Intuition pump • Logic and Creation • Not Circular Reasoning • Peanut butter argument • Great Beethoven fallacy • Fallacy of unique founding conditions • Evil is the absence of God • Argument from first cause • How do you know? Were you there? • Argument from design • Argument from beauty • Appeal to nature • Solferino fallacy • Religious scientists • Nothing to hide • Argument from fine tuning • Creep shaming • "I used to be an atheist" • Atheism as a religion • Argumentum ad populum • Argument from morality • Anti-environmentalism • Appeal to bias • Apophasis • Argumentum ad nauseam • Appeal to censorship • Argumentum ad sarcina inserta • Blaming the victim • Bait-and-switch • Danth's Law • Chewbacca Defense • Canard • DARVO • Demonization • Escape hatch • Friend argument • Everyone is racist • Gish Gallop • Greece-baiting • Gore's Law • Ham Hightail • Just asking questions • Leading question • Loaded language • Linking to authority • Loaded question • Lying by omission • Motte and bailey • Nazi analogies • Moving the goalposts • One single proof • Pink-baiting • One-way hash argument • Pathos gambit • Quote mining • Poisoning the well • Quidquid latine dictum sit, altum videtur • Race card • Red-baiting • Red herring • Release the data • Science was wrong before • Shill gambit • Straw man • Silent Majority • Uncertainty tactic • Style over substance • Terrorism-baiting • Weasel word • What's the harm (logical fallacy) • Whataboutism • Bullshit • Logical fallacy • Banana argument • Scapegoat • How come there are still monkeys? • Anti-racist is a code word for anti-white • Ontological argument • Omnipotence paradox • Presuppositionalism • Just a joke • Countless counterfeits fallacy •
Conditional fallacies:			Slippery slope • What's the harm (logical fallacy) • Special pleading • Conditional fallacy • On the spot fallacy • Appeal to the minority • Argumentum ad populum • Galileo gambit • Professor of nothing •
	Genetic fallacies:		Genetic fallacy •
		Appeals to authority:	Ipse dixit • Appeal to confidence • Argumentum ad populum • Argument from authority • Linking to authority • Silent Majority • Invincible authority • Appeal to celebrity • Ultracrepidarianism • Appeal to the minority • Galileo gambit • Appeal to identity • Weasel word • Professor of nothing • Euthyphro dilemma • Divine command theory •
		Ad hominem:	Ad iram • Argumentum ad cellarium • Bulverism • Poisoning the well • Blaming the victim • Tu quoque • Whataboutism • Nutpicking • Jonanism • Demonization • Shill gambit • Appeal to bias • Fallacy of opposition • Association fallacy • Damning with faint praise • Pathos gambit • Appeal to identity • Argumentum ad hominem • Nazi analogies • Not an argument • Nothing to hide • Scapegoat • 地下室论证 •
	Imprecision fallacies:		Apex fallacy • Overprecision • Cherry picking • Overgeneralization • Texas sharpshooter fallacy • False analogy • Appeal to fiction • Spotlight fallacy • Pragmatic fallacy • Selection bias • Anecdotal evidence • Category mistake • Nutpicking • Imprecision fallacy • Confounding factor • Fallacy of accident • Neyman's bias •
Valid logical methods:			Rapoport's Rules • Negative evidence • Reductio ad absurdum •
Fallacy collections:			SeekFind • Nizkor Project • Fallacy Files • Your Logical Fallacy Is • Logically Fallacious •