[[quoteright:300:[[Film/ABeautifulMind http://static.tvtropes.org/pmwiki/pub/images/beautiful_mind_0.jpg]]]]
[[caption-width-right:300:We have chalkboards for that sort of thing.]]

-> ''Imagination does not breed insanity. Exactly what does breed insanity is reason. Poets do not go mad; but chess-players do. Mathematicians go mad, and cashiers; [[MadArtist but creative artists]] very seldom. I am not, as will be seen, in any sense attacking logic: I only say that this danger does lie in logic, not in imagination.''
-->-- '''Creator/GKChesterton''', ''Orthodoxy''

Clearly, [[WritersCannotDoMath many writers]] (and [[ViewersAreMorons viewers]]) [[EverybodyHatesMathematics fear and dread mathematics]]. On rare occasion, a character is found who possesses a defining trait of having delved deeply into the study of profound mathematical knowledge. These characters are, as a rule, insane. It is not necessarily clear whether [[GoodWithNumbers advanced number theory]] is itself [[TheseAreThingsManWasNotMeantToKnow destructive to sanity]] (as with some forms of FormulaicMagic), or whether [[PowerBornOfMadness the insane are drawn to maths]]; nonetheless, the correlation seems to exist.

Many Mad Mathematicians will have a RoomFullOfCrazy with math equations.

See also MadScientist.

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!!Examples:

[[foldercontrol]]

[[folder:Anime and Manga]]
* While he's not crazy in the usual sense, Daichi/Bastion Misawa of ''Anime/YuGiOhGX'' does snap a bit more... strangely... during the White Society arc in season 2. The way he snaps out of it [[BrainBleach ain't pretty]]. His going insane was canonically because [[SmallNameBigEgo people weren't worshiping him as the brightest guy around anymore]], but the snap back (which involved stripping, and then racing around in his birthday suit) was indeed, induced by math. As a side note, before the FreakOut he was the proud owner of a RoomFullOfCrazy that he regularly repainted just so he could cover the walls with formulas all over again.
* Moriaki-sensei from ''SoredemoMachiWaMawatteiru'' looks like your average SternTeacher at first, but he takes Mathematics ''way'' too seriously.
* ''Manga/GambleFish''[='=]s [[TheHeavy Heavy]] Abandi is revealed to be one of these. In specific, he believes to discover a message from God itself within his mathematics. He tests whether or not he should share his discovery with anyone by suicidal exploits in hopes of testing whether or not God would protect him, ultimately leading to his StartToDarkness when he's electrocuted and believes he came BackFromTheDead.
* The third season has ''Anime/HellGirl'' has one of the villains of the week, Mizuragi Shogo, a mathematician who is obsessed with Hell because the Hell Girl sent his mother to Hell. Eventually, he was able to prove the existence of Hell and used the knowledge to create a device to keep Ai's minions away he could meet her on his own terms. To that end, he used hypnosis to artificially create a grudge against Tsugumi, who by that point has given up on trying to stop Ai from taking souls and is resigned to her fate. Shogo, Ai, Ai's minions and Tsugumi all get a resounding YoureInsane from Yuzuki. Eventually, Shogo's assistant banishes him to Hell so that several children who had been orphaned by Shogo's earlier inventions wouldn't make the contract at the cost of their own souls.
[[/folder]]

[[folder:Comic Books]]
* In TheDCU, the sentient GreenLantern mathematical progression Dkrtzy RRR was discovered by mad mathematician Timph Rye, who sought to prove that willpower could be derived formulaically. Dkrtzy RRR is itself of suspect mental stability; its tendency to corrode the minds of its enemies from the inside is... controversial among the ranks of the Corps.
* ''Comicbook/FantasticFour'': The Mad Thinker is a big brain mathemagician as well. He once managed to calculate how long it would take the Fantastic Four to invade an enemy fortress, take out the enemies, and escape, and had ''planted a bomb to go off exactly as they had left the building'' blowing up their mutual enemy but not the Four. How on Earth did he do that? 10 minutes to go in, factoring in the Human Torch's average temperature of 2000 celcius... carry the 2... divide by 5... leave 2 minutes for electric signals...
** *grabs black marker and crosses through entire sum* AARGH.
[[/folder]]

[[folder:Film]]
* ''Film/ABeautifulMind''. The whole movie, as well as the real person (John Nash) on whom it was based. As noted [[BunnyEarsLawyer elsewhere]], while the movie depicted his bout with schizophrenia, he wasn't exactly 'normal' before or after either.
* ''Film/{{Pi}}''. Max Cohen lives like a hermit, plagued by migraines and social anxiety as he dives into the mathematical heart of the universe. The closer he gets to [[TheseAreThingsManWasNotMeantToKnow the ultimate answer]], the more insane he becomes. The only way he can achieve peace is to [[spoiler:physically burrow out his mathematical ability by trepanning himself with a power drill]].
** [[Film/{{Ghostbusters}} "That would have worked if you hadn't stopped me."]]
* ''Theatre/{{Proof}}''. Entire movie (and, earlier, stage play) about a woman obsessed with the idea that she inherited both her father's mental illness and math abilities.
* [[EnsembleDarkhorse John Givings]] from ''RevolutionaryRoad''. After a mental breakdown, he's placed in the care of his parents. At first, he praises and admires the Wheelers for their desire to have something more out of life, rather than a conformist suburban existence. After they've abandoned these plans, he [[ClusterFBomb calls them out on their hypocrisy]].
* ''Film/SherlockHolmesAGameOfShadows'' conflates Professor Moriarty's legitimate mathematical research with his criminal career, especially if you read any of the articles on the actual (non-evil) mathematicians the filmmakers consulted with in order to design his personal financial code. [[http://www.oxfordmartin.ox.ac.uk/blog/view/131]]
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[[folder:Literature]]
* Sigismund Arbuthnot the mad maths master, in the ''Literature/{{Molesworth}}'' stories.
* Sir Austin Cardynge in the Literature/{{Lensman}} books, who in this respect can outthink even the superman Second Stage Lensmen (but not Arisians). We are told that he can actually think in the symbology of higher mathematics.
* In the Franchise/SherlockHolmes canon, Professor Moriarty is described as having a background in mathematics, although that doesn't really figure into his criminal career. (Some of the many adaptations place more emphasis on it, though.)
* John Givings from ''RevolutionaryRoad'' (see above).
* Mavolio Bent from the ''Literature/{{Discworld}}'' book ''Discworld/MakingMoney''. A man who could see the answer to an equation just by looking at it. Considers making a mistake to be the worst of sins one could ever do. Absolutely abhors all things he considers silly, which includes most things. [[spoiler: Once strangled a professional assassin to death with a humorous pink elephant made of balloons when his tenuous hold on reality went bye-bye and he embraced his clown heritage.]]
** A more harmless example is the TalkativeLoon Bursar of Unseen University. Mad as a spoon (in recent years, he's gotten better, mostly because the university staff hit upon the idea of using medication to have him hallucinate he was sane, the same way most people do), but can be calmed by asking him a complicated mathematical question, which he can figure out in about a second.
*** Or rather, asking him the mathematical question can be used as an effective gauge of his health; it won't necessarily calm him down, but, if you consider that he's ''a'' bursar as well as being ''The'' Bursar, making sure he can actually do his job is pretty much the only thing you can really ask of him. Unfortunately, in ''Discworld/TheScienceOfDiscworld'' he discovered ''advanced'' mathematics, and as of ''Discworld/UnseenAcademicals'' it's up to Ponder Stibbons to make sure things add up because the Bursar now "regards the decimal point as a nuisance".
* In {{Dragaera}}, the Dragaerans of the House of the Athyra who study pure logic and philosophy tend to become cold and evil, driven to pursue their studies at the expense of anything and anyone.
* The math monks of ''Literature/{{Anathem}}'' probably aren't mad, but their very sequestered lifestyle gets them pretty close. Of course, many in the outside world believe they actually are {{Mad Mathematician}}s. In the past, several Centenarian "math monks" actually did go mad, resulting in the coining of the slang term "to go Hundred", meaning "to go mad".
* Creator/HPLovecraft was never outright against mathematics, but it did seem to have some unfortunate consequences for his characters. For what is probably the most obvious example, in ''"Dreams in the Witch-House"'' a brilliant young mathematician moves into said house precisely ''because'' of hints that its most infamous former inhabitant of over two hundred years ago might have possessed certain mathematical knowledge -- notably about [[AlienGeometries the geometry of space and time]] -- not yet actually (re)discovered by modern science. [[CuriosityIsACrapshoot It does not end well]], partly because it turns out that [[spoiler:said witch is actually still alive and still as nasty as ever]].
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[[folder:Live Action TV]]
* The client in the ''Series/BurnNotice'' episode "Signals and Codes" is a cryptanalytic genius who's uncovered a conspiracy to sell government secrets, but he believes it's a conspiracy by evil aliens against good aliens who send him messages on beams of light. He's a schizophrenic who's been in and out of psych wards for years. He eventually gets a job and meds.
* Winifred Burkle in ''Series/{{Angel}}'' was a gifted young physicist who got trapped in AnotherDimension (more specifically, a demon-ruled, medieval-level CrapsackWorld where humans are treated like cattle) for five years. She quickly recovered and became one of the main characters after returning with the heroes to Los Angeles, but when they first met her she'd taken to [[RoomFullOfCrazy scribbling equations on cave walls...]]
-->'''Angel''': Fred here might be able to help us with that. She knows a lot about portals.
-->'''Fred''': Not a lot. The trionic speechcraft formulation/modification has to alter the dynamic-reality sphere. Lutzbalm predicted it at Zurich in '89. Laughed him off the stage, although this slavery and degradation's no laughing matter. (suddenly laughs insanely for a minute and then abruptly stops) It's no Crug-grain and Kalla berry breakfast alright.
-->'''Angel''': ...she's been here a while.
* In the sitcom ''Committed'', this is a DefiedTrope for Nate, who comes from a family of geniuses who tend to eventually go insane. Though he studied physics at Yale, he works in a used record store in an effort to avoid his relatives' fate. It's only partially successful.
* The Doctor from ''Series/DoctorWho'', to some extent. According to [[http://tardis.wikia.com The DW Wiki]], the Time Lords used rather scary mathematics to grow [=TARDISes=], among other things. The Doctor is no exception to this.
-->"Any number that reduces to one when you take the sum of the square of its digits and continue iterating it until it yields 1 is a happy number, any number that doesn't, isn't. A happy prime is both happy and prime. Now ''type it in''! I dunno, talk about dumbing down. Don't they teach recreational mathematics anymore?"
** Excess math would certainly account for The Doctor's eccentric nature, not that he needs another excuse.
* The unsub in the ''Series/CriminalMinds'' episode "Derailed" had to take a few years off from his groundbreaking work on M-theory to be involuntarily committed due to his violent schizophrenia.
* Cassie in ''Series/TheLibrarians2014'' has extreme mathematical abilities (she can calculate in ''seven'' dimensions in her head) and synesthesia which in combination can make her constantly repeat certain phrases or pass out under the load of too much information.
[[/folder]]

[[folder:Music]]
* DoctorSteel is a mad scientist who sings about the ''Fibonacci Sequence''.
* JonathanCoulton is apparently of the opinion that now and again, a great mathematician will come along and actually ''decrease'' the madness of the field by solving or figuring out something that had been flummoxing his compatriots, if the first verse of the song ''Mandlebrot Set'' is anything to go by.
-->"Pathological monsters!" cried the terrified mathematician\\
Every one of them is a splinter in my eye\\
I hate the Peano Space and the Koch Curve, I fear the Cantor Ternary Set\\
And the Sierpinski Gasket makes me want to cry\\
And a million miles away, a butterfly flapped its wings\\
On a cold November day, a man named Benoit Mandelbrot was born
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/TheWorldEndsWithYou'' has Sho Minamimoto, who shouts trigonometric functions when attacking, gives out missions like "Beat the bosses of 2.2360679's 0 + 5. t = 60 min."[[note]]The game is about a "Reaper's Game" where you try to win back your right to exist through missions assigned by the PunchClockVillain who supervises the contest (Sho being the second one to get the job). This particular mission means you have to beat two minibosses in areas 0 and 5 of Route 5 (2.2360679 being the square root of 5), which are the scramble crossing and the Udagawa district, respectively.[[/note]], is the trope image for MouthfulOfPi and is also a complete psychopath. To get an idea, see the quote page. (You zetta sons of digits.)
* The game ''PiRSquared'' has the ExcusePlot that you're a mathematician who's gone inside his own mind to try and collect various mathematical formulas and avoid going insane.
* The ''VideoGame/{{BioShock|1}}'' DLC Minerva's Den has Reed Wahl, the co-inventor of the supercomputer known as The Thinker whose [[PsychoSerum splicing induced madness]] manifested in a delusion of the existence of a 'predictive equation' that would allow him to see the future, the "discovery" of which depended on The Thinker. The titular Minerva's Den is covered in numbers and algebraic symbols in paint, chalk and blood from dozens of corpses, all presumably Wahl's work. Wahl also has the habit of stating that pretty much all of Sigma's actions (including ''dying'') have either been foreseen by the Thinker or that they're "slightly behind schedule".
-->'''Wahl''': [[MeaningfulName Sigma]] [[DeadlyEuphemism must be removed from the equation.]]
* N from ''VideoGame/PokemonBlackAndWhite'' shows tendencies towards this. He adores functions and formulas, carries a Menger Sponge accessory, and he's trying to "solve the equation to change the world". His OneLetterName even fits, since "n" is frequently used as a variable in math equations. However, he's not so much insane as he is... [[WellIntentionedExtremist horribly misguided]], [[spoiler: a [[AdultFear sheltered and abused]] ManChild TykeBomb designed to destroy Unova's political system so his TreacherousAdvisor can take over]], and convinced that HumansAreBastards.
* ''VideoGame/{{OFF}}'' has ThemeNaming in the attacks of all characters and most enemies. Guess what the attacks of the most powerful non-boss enemies, the [[DemonicSpiders Secretaries]], are named after. The Zone 3 Secretaries ''Vertical Limit'' is easily the hardest-hitting attack in the game. The same Zone 3 Secretaries can also ''Divide By Zero'', which doesn't cause a RealityBreakingParadox [[spoiler:(maybe because reality is already broken)]] but can inflict some nasty status conditions.
* Kazuaki from ''VisualNovel/{{Hatoful Boyfriend}}'' is a narcoleptic mathematician. [[spoiler:And his calm exterior is a complete front - he's been mad with grief and desire for revenge ever since the death of his brother.]]
* Dive from ''VideoGame/{{Divekick}}'' dabbles in this, applying his talent for calculating angles [[MartialArtsAndCrafts to his divekicking]], and the majority of his win and defeat quotes being math-related.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/KimPossible'': The Mathster
* ''WesternAnimation/DextersLaboratory'': The Evil Math-Magician
[[/folder]]

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Attention, you factoring Hectopascals! [[VideoGame/TheWorldEndsWithYou (It's x 2)DIE!!]]
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