A Catch-22, coined by Joseph Heller in his novel Catch-22, is a paradox in rules, regulations, procedures, or situations in which one has knowledge of being or becoming a victim but has no control over it occurring.

Contents 1 Logic 2 Other uses from the novel 3 Significance of the number 22 4 See also 4.1 False dilemmas and circular logic 4.2 Non-false dilemma situations 5 References

[edit] Logic

The archetypal Catch-22, as formulated by Heller, involves the case of John Yossarian, a U.S. Army Air Forces bombardier, who wishes to be grounded from combat flight duty. To be grounded, he must be officially evaluated by the squadron's flight surgeon and then found "unfit to fly."

"Unfit" would be any pilot that is actually willing to fly such dangerous missions: as one would have to be mad to want to take on such missions.

But the "problem" is that to be declared "unfit", he must first "ask for evaluation", which is considered as a sufficient proof for being declared "sane". These conditions make being declared "unfit" impossible.

The "Catch 22" is that "anyone who wants to get out of combat duty, isn't really crazy" ^[1] Hence, pilots who request a fitness evaluation are sane, and therefore must fly in combat. At the same time, if an evaluation is not requested by the pilot, he will never receive one (i.e. they can never be found "insane"), meaning he must also fly in combat.

Therefore, Catch-22 ensures that no pilot can ever be grounded for being insane - even if they were.

A logical formulation of this situation is:

1. (Premise: If a person is excused from flying (E), that must be because they are both insane (I), and request an evaluation (R));

2. (Premise: If a person is insane (I), they should not realize that they are, and would have no reason to request an evaluation)

3. (2, Definition of implication: since an insane person would not request an evaluation, it follows that all people must either not be insane, or not request an evaluation)

4. (3, De Morgan: since all people must either not be insane, or not request an evaluation, it follows that no person is both insane and request an evaluation)

5. (4, 1, Modus Tollens: since a person may be excused from flying only if they are both insane and request an evaluation, but no person can be both insane and request an evaluation, it follows that no person can be excused from flying)

[edit] Other uses from the novel

Besides referring to an unsolvable logical dilemma, Catch-22 is invoked to explain or justify the military bureaucracy. For example, in the first chapter it requires Yossarian to sign his name to letters that he censors while he is confined to a hospital bed. One clause mentioned in chapter 10 closes a loophole in promotions, which one private had been exploiting to reattain the attractive rank of Private First Class after any promotion. Through court-martials for going AWOL, he would be busted in rank back to PFC, but Catch-22 limited the number of times he could do this before being sent to the stocade.

In chapter 6, Yossarian is told that Catch-22 requires him to do anything his commanding officer tells him to do, regardless of whether these orders contradict orders from the officer's superiors. In Chapter 39 an old woman relates that soldiers had claimed that the actual text of Catch-22 did not have to be revealed when carrying out orders related to it, meaning that, “they have a right to do anything we can’t stop them from doing.”. This exchange convinces Yossarian that Catch-22 does not even exist, but because the powers that be claim it does, and the world believes it does, it nevertheless has potent effects. Indeed, because it does not exist there is no way it can be repealed, undone, overthrown, or denounced.

At one point, Captain Black pressures Milo into depriving Major Major of food based on fabricated charges by comparing the situation to Catch-22. He asks, "You're not against Catch-22, are you?" Captain Black wants Major Major punished for not signing a loyalty oath, despite never giving Major the opportunity to sign it.

In chapter 40, Catch-22 forces Colonels Korn and Clathcart to promote Yossarian to Major and ground him rather than simply sending him home. They fear that if they don't, others will refuse to fly, just as Yossarian did.

[edit] Significance of the number 22

According to many sources^[2] Heller originally wanted to call the phrase, and thence the book, by other numbers, but he and his publishers eventually settled on 22. The number has no particular significance; it was chosen more or less for euphony.

[edit] See also

[edit] False dilemmas and circular logic

Situations which have logical similarities to a Catch-22.

• Circular logic
• False dilemma
• Irony
• No-win situation — real choices exist, but no choice leads to success.
• Reductio ad absurdum
• The Lady, or the Tiger? — a short story involving a princess who must make a decision in a false dilemma situation.

[edit] Non-false dilemma situations

Situations which may be confused with a Catch-22, but have quite different logic or outcomes.

• Chicken or the egg — a seemingly unbreakable cycle of causation, which has an unknown origin.
• Cornelian dilemma — a choice between actions which will all have a detrimental effect on the chooser or on someone they care for.
• Deadlock — in computing, when two processes reach a standstill or impasse, each waiting for the other to finish.
• Double bind — a forced choice between two logically conflicting demands.
• Hobson’s choice — the choice between taking an option or not taking it.
• Lesser of two evils principle — a choice between two undesirable outcomes.
• Morton’s Fork — a choice between two equally unpleasant alternatives.
• Paradox — a statement or group of statements that leads to a contradiction or a situation which defies intuition.

[edit] References