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    A
  1. Abacus
  2. Abscissa
  3. Absolute Value
  4. Abundant Numbers
  5. Accumulate
  6. Accurate
  7. Achiral
  8. Acre
  9. Acute
  10. Ada, Computer Language
  11. Add
  12. Addend
  13. Adjacent
  14. Aeon
  15. Affine Geometry
  16. Agnesi's Witch curve
  17. Ahmes Papyrus
  18. Alabama Paradox - voting
  19. Alchemy
  20. Aleph-Null
  21. Algebra
  22. Algebraic Numbers
  23. Algorithm
  24. Aliquot Parts
  25. "All Models are Wrong" quote
  26. Altitude
  27. Altitude of triangle, Properties
  28. Amblygon
  29. Amicable Numbers or Pairs
  30. Amplitude
  31. Analemma
  32. Analogy
  33. Angle
  34. Angle Bisectors in a Triangle
  35. Angstrom (unit of length)
  36. Annual
  37. Annulus
  38. Annus Mirabilis - Newton's Miracle Year
  39. Anode - creation of the term
  40. Antares
  41. Antecedent
  42. Anti-Center
  43. Antiparallel
  44. Aphelion
  45. Apoapsis
  46. Apogee
  47. Apollonius Gasket
  48. Apollonius Point
  49. Apollonius Problem
  50. Apothem
  51. Apportionment
  52. Approval Voting
  53. Apse
  54. Apside
  55. Arbelos
  56. Arc
  57. Archimedes Square Dissection Puzzle
  58. Arc Sine or Sin-1
  59. Are
  60. Area
  61. Argand Diagrams
  62. Argument
  63. Arithmetic
  64. Arithmetical Frames; (old teaching devices)
  65. Arithmetic Books, Early American
  66. arithmetic Books, First North American
  67. Arms of a right triangle, blog about the development of the term
  68. Arrive
  69. Asses' Bridge
  70. Associative
  71. Astroid
  72. Astronaut
  73. Astronomical Unit / AU
  74. Asymptote
  75. Atlas
  76. Atom
  77. Aubel's Theorem
  78. Average
  79. Avoirdupois
  80. Axiom
  81. Axis

  82. B
  83. Babylonian Square Root Method
  84. Bacon, Francis; stained glass at Wren Library, Cambridge
  85. Bakhshali Manuscript
  86. Barometer
  87. Barrow, Isaac; stained glass at Trinity Chapel, Cambridge
  88. Barycenter
  89. Baryon
  90. Base
  91. Bayes' Theorem
  92. Bell Curve
  93. Bell's Numbers or Bell Numbers
  94. Benford's Law
  95. Bernoulli's Golden Theorem
  96. Bernoulli Numbers
  97. Bertrand's Postulate (a prime between n and 2n)
  98. The Big Bang
  99. bi-gon (two sided polygon?)
  100. Billion
  101. Bimedian of Quadrilateral
  102. Binary Numbers
  103. Binomial
  104. Binomial Coefficients
  105. Bisect
  106. Bisectors (ANGLE) in a Triangle
  107. Blackboard, History of
  108. Additional notes on History of Blackboards and slates
  109. Bode's Law
  110. Bounds and Butts (land measure)
  111. Borda Voting
  112. Borrow (in Subtraction)
  113. Bottle Imp Paradox
  114. Bowditch Curves
  115. Box Plot
  116. Brachystochrone
  117. "Bracket X", or Bracket Function
  118. Brahmagupta's Formula
  119. Brahmagupta's Identity on the sums of two squares
  120. Brahmagupta's Multiplication method
  121. Butts and Bounds (land measure)
  122. The Bride's Chair
  123. Bridge of Asses
  124. Brocard's Problem
  125. Bruns Constant
  126. Bureau

  127. C
  128. C, symbol for Radians
  129. Caduceus
  130. Calculate / Calculus
  131. Calendar
  132. Camera / Camera obscura
  133. Cardinal
  134. Cardinality
  135. Carat
  136. Cardioid
  137. Caret
  138. Carmichael Numbers
  139. Carnot's Theorem
  140. Carroll's Logic Diagrams (by Lewis Carroll)
  141. Carry (arithmetic)
  142. Casting out nines
  143. Casting out elevens
  144. Catalan Numbers
  145. Catenary
  146. Cathetus
  147. Cathode - creation of the term
  148. Cauchy distribution
  149. Ceiling Function,
  150. Census
  151. Center
  152. Centroid or Center of Gravity
  153. Century
  154. Ceres
  155. Cesaro-Stolz Theorem
  156. Ceva's Theorem
  157. Cevian
  158. Chain or Gunter's Chain
  159. Chain Reaction
  160. Chaos
  161. Check
  162. Check methods for arithmetic
  163. Chebyshev's theorem.(a prime between n and 2n)
  164. Chie-no-ita, Chinese puzzle
  165. Chilihedron
  166. Chinese Checkers
  167. Chinese Postman's Problem
  168. Chinese Square Root Method
  169. Chiral
  170. Chi Square
  171. Choose
  172. Chord
  173. Circle
  174. Circuit
  175. Circulate Numbers
  176. Circumcenter
  177. Circumcircle
  178. Circumference
  179. Circumscribe
  180. Class
  181. cloff, commercial discount
  182. Clue
  183. Coefficient
  184. Collatz's Problem
  185. Collinear
  186. Combinations
  187. Commandino's Theorem
  188. Commutative
  189. Compass
  190. Complementary
  191. Complete Graph
  192. Complete Oriented Graph
  193. Complex Fraction
  194. Complex Numbers
  195. Component
  196. Composite & Compound
  197. Compute
  198. Concurrent
  199. Concyclic
  200. Condorcet Voting
  201. Cone
  202. Confidence Interval
  203. Confounding Variables (statistics)
  204. Congruent
  205. Conic Section
  206. Conic Surface
  207. Conjecture
  208. Conjugate
  209. Conjugate Angles
  210. Consequent
  211. Constant
  212. Contact Triangle
  213. Continuous
  214. Converse
  215. Convex
  216. Coordinates
  217. Corollary
  218. Correct
  219. Correlation
  220. Correlation Coefficient
  221. Cosecant
  222. Cosine
  223. Cosines, Law of
  224. Cosine Circle (2nd Lemoine)
  225. Cosmic Rays
  226. Cosmos
  227. Coss and Cossists
  228. Cotangent
  229. Cotes, Roger; stained glass at Trinity Chapel, Cambridge
  230. Counting Boards
  231. Counting Numbers
  232. Crafoord Mathematical Prize
  233. Cramer's Rule
  234. Crescent
  235. Critical Points
  236. Cube
  237. Cube roots, by hand
  238. Cuisenaire rods
  239. Cumulative
  240. Curator
  241. Curtate Cycloid
  242. Cusp
  243. Cybernetics
  244. Cyclic Quadrangles (Quadrilateral)
  245. Cycloid
  246. Cylinder
  247. Cylindrical Projection, MAP

  248. D
  249. Dart, type of quadrilateral
  250. Data/Datum
  251. Dean
  252. Decade
  253. Des Cartes' Circle Thm
  254. Decimal Fractions
  255. Decimal Point & Decimal Comma
  256. Decimal Repeat Bar
  257. Decrease
  258. Degree
  259. Degrees, Why 360 in a circle?
  260. de Gua's Theorem.
  261. Deltoid
  262. Denominator
  263. Derangement
  264. Derivative
  265. Derive
  266. Determinant
  267. Deviation
  268. Devil's Curve
  269. Diagonal
  270. Diagram
  271. Diameter
  272. Diamond
  273. Dice / Die
  274. Dido's Problem
  275. Difference
  276. Difference symbol "~"
  277. Digit
  278. Digital Root
  279. Digon (two sided polygon?)
  280. Dimension
  281. Di-graph or Directed Graph
  282. Discount
  283. Discriminant
  284. Distance
  285. Divide
  286. Dividend
  287. Divide, Symbols for
  288. Divisor
  289. divisor function, sigmakn
  290. Dodecagon
  291. Dodecahedron
  292. Domain
  293. Dollar
  294. Dollar Symbol $
  295. Dot as symbol for multiplication
  296. Double Dummy
  297. Dozen
  298. Drawers of Dirichlet
  299. Droz-Farny Theorem
  300. Duplation and Mediation

  301. E
  302. e for 2.71828...
  303. East
  304. Edge
  305. Egyptian Multiplication
  306. Einstein's Biggest Blunder
  307. Electricity
  308. Electron
  309. Ellipse
  310. Ellipsis
  311. Ellipsoid
  312. Empty Set
  313. Enantiomorphic
  314. End of proof symbol,
  315. Early American Math Textbooks
  316. Eon
  317. Eocene
  318. Eohippus
  319. Equal
  320. = , Equal Symbol
  321. Equation
  322. Equiangular
  323. Equilateral
  324. Equivalent
  325. Ether
  326. Euclid's Algorithm at Cut-the-Knot
  327. Euler Circuits
  328. Euler Line
  329. Euler Path or Circuit
  330. Euler's Planer Graph Theorem (proof) V+F=E+2
  331. Excenter and Excircle
  332. Explementary
  333. Exponent
  334. Extrapolate

  335. F
  336. Factor & Factorial
  337. Factoring (as in "factoring a quadratic")
  338. Fagnano's Problem
  339. Fair division of Assets and Obligations, Discrete Math Notes
  340. February
  341. Fermat Point
  342. Fermat's Last Theorem
  343. Fermat's Little Theorem
  344. Feuerbach's Circle
  345. Fibonacci's Identity on the sums of two squares
  346. Fibonacci's Sequence
  347. Fields Medal
  348. The Fifteen Puzzle, a blog about that famous little sliding puzzle game that swept the world.... and a link to a FREE download to play.
  349. First
  350. Floor Function,
  351. Focus
  352. Forest (planer graph)
  353. Formula
  354. Forty, (why there is no "U" in,)
  355. Four
  356. Fourth Proportional
  357. Fractal
  358. Fraction
  359. Fractional Exponents
  360. Fraction Bar
  361. Frequency
  362. Friday
  363. Friendly Numbers
  364. Frustum
  365. Function
  366. Fundamental Counting Theorem
  367. Furlong (length)

  368. G
  369. Galaxy
  370. Galley method of Division
  371. Gallon
  372. Gallows Function,
  373. Gamma Function
  374. President Garfield's Pythagorean Proof
  375. Gas
  376. Gaudi Magic Square
  377. Gauging
  378. Gelosie Multiplication
  379. Geoboard
  380. Geocenter
  381. Geometric Mean
  382. Geometry
  383. Geometry, Royal Road to?
  384. Gergonne Point / Triangle
  385. Gibbous (phases of moon)
  386. Gilbert, Unit of measure
  387. Girard's Thm
  388. Gnomen
  389. Googol
  390. Gougu Rule
  391. Grad - angle measurement
  392. Grade (of road, etc.)
  393. Graham's Number
  394. Gram, unit of weight(mass)
  395. Graph
  396. Graph Paper
  397. Graphic Solutions to Quadratic Equations
  398. Graph Theory
  399. Grave, early unit for Kilogram
  400. Greater Than Symbol
  401. Greatest Common Factor, Using Euclid's Algorthm at Cut-the-Knot
  402. Greatest Integer Function
  403. Grebe Point
  404. Gross
  405. Gunter's chain"
  406. Gunter's scale"

  407. H
  408. Half, 1/2
  409. Half-Period
  410. Halma, board game
  411. Halmos symbol,
  412. Hamilton's Apportionment Method
  413. Hamiltonian Circuits
  414. Hanoi, Tower of Puzzle
  415. Harmonic Mean
  416. Harmonic Sequence
  417. Hash symbol, #
  418. Haversine
  419. Hawthorne Effect
  420. Heap Paradox
  421. Hectare
  422. Height
  423. HemiSphere
  424. Hein, Piet
  425. The Helen of Geometers
  426. Helium
  427. Helix
  428. Hermetic Seal
  429. Heron's Formula or Hero's Formula
  430. Heronian Mean
  431. Heron's Problem
  432. Heteroscedastic
  433. Hex, the game
  434. Hexdecimal
  435. Hinge
  436. Hippocrates Lune
  437. Hippocratic Oath
  438. Histogram /Histograph
  439. History, Notes on Math teaching
  440. Hoehn's Thm
  441. Hollerith Cards
  442. Homoscedastic
  443. Hoppity, old Enlish board game
  444. Horizon / Horizontal
  445. Hornbooks
  446. Horsepower
  447. Hour
  448. Houses and Utilities Problem (proof)
  449. Hubble (Unit of distance)
  450. Hundred
  451. Hyperbola
  452. Hyperbole
  453. Hypercube
  454. Hypocycloid of Four Cusps
  455. Hypocycloid of Three Cusps
  456. Hypodermic
  457. Hypotenuse

  458. I
  459. i for square root of -1
  460. identity and symbol ≡
  461. Ides
  462. Idiot
  463. IFF symbol
  464. Imaginary Numbers
  465. Incenter and Incircle
  466. Increase
  467. Increment
  468. Index
  469. Induction, Inductive Proof
  470. Inequality Symbols
  471. Infinitesimul
  472. Infinity
  473. Infinity Symbol
  474. Imperial Gallon
  475. Inscribe
  476. Int Function
  477. Integer
  478. Interpolate
  479. Interval
  480. interquartile range
  481. Inverse Sine or Sin-1
  482. Inverse Square Law
  483. Iodine
  484. Ion - creation of the term
  485. IQR
  486. Irrational Numbers
  487. Iridium
  488. Iris
  489. Ishango Bone
  490. Isogon - Isogonic Lines, Points, Symmetry
  491. Isometry
  492. Isomorphic
  493. Isomorphic symbol,
  494. Isoperimetric
  495. Isopleure, Isopleuron
  496. Isosceles
  497. Italian Method of Division

  498. J
  499. January
  500. Japanese Tangram type puzzle
  501. Jefferson's Apportionment Method
  502. Jerk
  503. Johnson's Theorem
  504. Josephus Problems
  505. Julia Set

  506. K
  507. Kaprekar Numbers
  508. Karat
  509. Kilogram Mass and Force
  510. Klein Bottle
  511. Kissing Circles Theorem
  512. Kite
  513. Knot, (Unit of speed)
  514. Knots and Knot Theory
  515. Kurschak's Theorem
  516. Kurtosis

  517. L
  518. Lame's Numbers
  519. Lattice Multiplication
  520. latus rectum
  521. lb, Pound
  522. Law of Cosines
  523. Law of Large Numbers
  524. Law of Sines
  525. Law of Tangents
  526. League (measure of distance)
  527. Leg
  528. Lemma
  529. Lemniscate
  530. Lemoine Point / Circles
  531. Lens (intersection of two circles)
  532. Leptokurtic
  533. Less Than Symbol
  534. l'Hospital's Rule
  535. Liar's Paradox
  536. Lies, Damned Lies, and Statistics
  537. Lill Circle, A Graphic Solution to Quadratic Equations
  538. Limacon
  539. Limit
  540. Line
  541. Lissajous Figures
  542. ln for natural logarithm
  543. Loculus of Archimedes
  544. Locus
  545. Logarithm
  546. Log-line (instrument for nautical speed)
  547. Long Ton
  548. Lotka's Law
  549. Loxodrome
  550. Lozenge
  551. Lucas Sequence
  552. Ludolph's Number
  553. Lune
  554. Lurking Variables (statistics)

  555. M
  556. "m" for Slope
  557. Macron
  558. Magic Squares
  559. Magnetic Declanation Map (first)
  560. Magnitude
  561. Maltitudes
  562. Mantissa
  563. Matrix
  564. Mars
  565. Mathbooks, Early American
  566. Mathematics
  567. Mathot's Point
  568. Maximum
  569. Mean
  570. Mean Proportional
  571. Measure
  572. Measuring Four Gallons using a Five and Three Gallon Jug, some history (Blog)
  573. Medial Triangle
  574. Median (Origin & statistics)
  575. Medians of a Triangle
  576. Menelaus' Thm
  577. Mercator Projection, MAP
  578. Mercury
  579. Merels, the game
  580. Merhkat
  581. Meter
  582. Metric Ton
  583. Mil or Mill (1/1000)
  584. Mile
  585. Million
  586. Minor
  587. Minuend
  588. Minus
  589. Minute
  590. Miquel's Point & Theorem
  591. Miquel's Pentagon Theorem
  592. Mobius Strip
  593. Mode
  594. Modulus
  595. Mollweide Equations
  596. Monge's Theorem on common tangents of circles
  597. Monge's Point
  598. Monomial
  599. Monte Carlo Method
  600. Months and their Names
  601. Morley's Theorem
  602. Morris, (Nine Men's-) the game
  603. Moscow Papyrus
  604. Mu, , for the average
  605. Multiple Factorial
  606. multiplicand
  607. Multiplication (Ancient/Old methods)
  608. multiplier
  609. multiply
  610. Myriad