PlanetMath (more info)
 Math for the people, by the people. Sponsor PlanetMath
Encyclopedia | Requests | Forums | Docs | Wiki | Random | RSS  
Login
create new user
name:
pass:
forget your password?
Main Menu
sections
Encyclopædia
Papers
Books
Expositions

meta
Requests (236)
Orphanage
Unclass'd (1)
Unproven (540)
Corrections (49)
Classification

talkback
Polls
Forums
Feedback
Bug Reports

downloads
Snapshots
PM Book

information
News
Docs
Wiki
ChangeLog
TODO List
Copyright
About
References to 'intersection'
1. $G_\delta$ set by rspuzio
2. $n$-section of line segment with compass and straightedge by pahio
3. $\mathbb{R}^2 \setminus C$ is path connected if $C$ is countable by silverfish
4. a characterization of the radical of an ideal by CWoo
5. a compact metric space is second countable by azdbacks4234
6. a space is T1 if and only if every subset A is the intersection of all open sets containing A by waj
7. absolute convergence implies uniform convergence by rspuzio
8. absorbing element by pahio
9. affine geometry by CWoo
10. Alexandroff space by joking
11. ambiguous grammar by CWoo
12. an outline of Hilbert's programme by gribskoff
13. analytic set by gel
14. angle between two lines by pahio
15. antichain by Henry
16. arbitrary join by CWoo
17. Archimedes' cylinders in cube by pahio
18. area of a polygonal region by Mathprof
19. area of a spherical triangle by Mathprof
20. atom by CWoo
21. automatic presentation by mathcam
22. axiom by rmilson
23. axiom schema of separation by Sabean
24. axiomatizable class by CWoo
25. Baire category theorem by Koro
26. Baire space by Koro
27. barycentric subdivision by CWoo
28. Beltrami-Klein model by Wkbj79
29. betweenness in rays by CWoo
30. Birkhoff prime ideal theorem by CWoo
31. blocks of permutation groups by rm50
32. Boolean operations on automata by CWoo
33. Boolean ring by yark
34. Boolean subalgebra by CWoo
35. Borel subgroup by CWoo
36. Bourbaki, Nicolas by Daume
37. branch by Henry
38. butterfly theorem by giri
39. B\'ezout's theorem (Algebraic Geometry) by rspuzio
40. Cantor's Intersection Theorem by paolini
41. Cartesian product by djao
42. Cauchy residue theorem by djao
43. center normal and center normal plane as loci by pahio
44. centroid by drini
45. Ceva's theorem by drini
46. characteristic function by bbukh
47. characterization of free submonoids by Ziosilvio
48. characterization of prime ideals by GrafZahl
49. Chomsky-Sch\"utzenberger theorem by CWoo
50. Choquet's capacitability theorem by gel
51. circle has one center by Wkbj79
52. circle with given center and given radius by Wkbj79
53. circumcircle by yark
54. cissoid of Diocles by pahio
55. classical problems of constructibility by Wkbj79
56. clopen subset by mathcam
57. closure by mathwizard
58. closure and interior of Cantor set by rspuzio
59. closure of a relation with respect to a property by CWoo
60. closure properties on languages by CWoo
61. club filter by Henry
62. common point of triangle medians by pahio
63. compact element by CWoo
64. compact pavings are closed subsets of a compact space by gel
65. compact subspace of a Hausdorff space is closed by ehremo
66. compactness and accumulation points of nets by azdbacks4234
67. compass and straightedge construction of angle bisector by Wkbj79
68. compass and straightedge construction of center of given circle by Wkbj79
69. compass and straightedge construction of duplicating an angle by Wkbj79
70. compass and straightedge construction of geometric mean by Wkbj79
71. compass and straightedge construction of inverse point by Wkbj79
72. compass and straightedge construction of parallel line by pahio
73. compass and straightedge construction of perpendicular by Wkbj79
74. compass and straightedge construction of regular pentagon by Wkbj79
75. compass and straightedge construction of regular triangle by Wkbj79
76. compass and straightedge construction of square by Wkbj79
77. complete lattice homomorphism by porton
78. concepts in set theory by matte
79. conditions for a collection of subsets to be a basis for some topology by waj
80. cone by matte
81. cone in $\mathbb{R}^3$ by pahio
82. conformal mapping by rspuzio
83. conformality of stereographic projection by pahio
84. congruence axioms by CWoo
85. congruence relation on an algebraic system by CWoo
86. conic section by drini
87. conjugate diameters of ellipse by pahio
88. connected topological group is generated by any neighborhood of identity by asteroid
89. consequence operator determined by a class of subsets by rspuzio
90. construction of central proportional by pahio
91. construction of fourth proportional by pahio
92. construction of regular $2n$-gon from regular $n$-gon by Wkbj79
93. construction of tangent by pahio
94. converse of isosceles triangle theorem by Wkbj79
95. convex angle by pahio
96. core of a subgroup by yark
97. crossed quadrilateral by pahio
98. curve by rmilson
99. CW complex by antonio
100. cylinder by stevecheng
101. de Morgan's laws by mathcam
102. deletion operation on languages by CWoo
103. dense set by yark
104. derangement by CWoo
105. derivation of a definite integral formula using the method of exhaustion by ruffa
106. derivation of integral representations of Jacobi $\vartheta$ functions by rspuzio
107. derivation of second formula for surface integration with respect to area by rspuzio
108. derivation of unit vectors in curvilinear coordinates by swapnizzle
109. derived Boolean operations by CWoo
110. determining the continuations of exponent by pahio
111. deterministic pushdown automaton by CWoo
112. development by mathcam
113. diametral points by pahio
114. dihedral angle by pahio
115. direct image by djao
116. discrete space by mathcam
117. disjoint by djao
118. disjoint union by yark
119. distance of non-parallel lines by pahio
120. distributivity in po-groups by CWoo
121. Dynkin system by mathwizard
122. elliptic curve by djao
123. elliptic curve cryptography by PrimeFan
124. equivalent automata by CWoo
125. essential subgroup by gh0st
126. estimation of index of intersection subgroup by pahio
127. Euclidean axiom by Hilbert by pahio
128. every second countable space is separable by drini
129. example needing two Lagrange multipliers by pahio
130. example of a Bezout domain that is not a PID by Wkbj79
131. example of analytic continuation by pahio
132. example of Boolean algebras by CWoo
133. example of finding catacaustic by pahio
134. example of isogonal trajectory by pahio
135. example of Schreier's Lemma by Algeboy
136. examples of algebraic systems by CWoo
137. examples of groups by AxelBoldt
138. examples of locally compact and not locally compact spaces by AxelBoldt
139. examples of ring of sets by rspuzio
140. examples of rings by matte
141. existence of maximal semilattice decomposition by mclase
142. extending a capacity to a Cartesian product by gel
143. f-vector by mps
144. field adjunction by pahio
145. filter by Koro
146. filter basis by rspuzio
147. finite complement topology by mathcam
148. finite fields of sets by rspuzio
149. finite nilpotent groups by Algeboy
150. finite plane by marijke
151. finite projective plane by Mathprof
152. finite projective planes have $q^2+q+1$ points and $q^2+q+1$ lines by marijke
153. forcing by ratboy
154. forcings are equivalent if one is dense in the other by Henry
155. Frattini subgroup by Evandar
156. free hull by Ziosilvio
157. freely generated inductive set by CWoo
158. fundamental theorem on isogonal lines by drini
159. fuzzy subset by ggerla
160. general position by jgade
161. generalized Van Kampen theorems (HD-VKT), higher dimensional by bci1
162. generated subring by polarbear
163. generatrices of hyperbolic paraboloid by pahio
164. generic manifold by jirka
165. geodesic by Mathprof
166. geometric representation of relation composition by Jon Awbrey
167. geometry as the study of invariants under certain transformations by rspuzio
168. Gershgorin's circle theorem result by saki
169. Giuseppe Peano by PrimeFan
170. group socle by Algeboy
171. harmonic conjugate function by pahio
172. Hayashi's connecting lemma by Koro
173. Heron's principle by pahio
174. high school mathematics by matte
175. homothetic by drini
176. homotopes and isotopes of algebras by Algeboy
177. Hough transform by madmortigan
178. hyperbolas orthogonal to ellipses by pahio
179. hyperplane separation by stevecheng
180. ideal generated by a subset of a ring by mathcam
181. ideal generators in Pr\"ufer ring by pahio
182. ideal inverting in Pr\"ufer ring by pahio
183. ideals with maximal radicals are primary by joking
184. incenter by mps
185. incidence geometry by CWoo
186. incidence structure by CWoo
187. incircle by drini
188. indexing set by Wkbj79
189. induction by Daume
190. infinitesimal by mps
191. inflection points and canonical forms of non-singular cubic curves by rspuzio
192. initial topology by kompik
193. integral element by pahio
194. integrity characterized by places by pahio
195. intercept theorem by pahio
196. intercession by WM
197. internal point by jirka
198. intersection divisor for a quartic by alozano
199. intersection of complex analytic varieties is a complex analytic variety by jirka
200. intersection of quadratic surface and plane by pahio
201. intersection of sets by drini
202. intersection of sphere and plane by pahio
203. intersection semilattice of a subspace arrangement by CWoo
204. intersection structure by CWoo
205. invariant forms on representations of compact groups by bwebste
206. inverse image by djao
207. inversion of plane by pahio
208. irredundant by CWoo
209. isogonal conjugate by drini
210. isogonal trajectory by pahio
211. Jacobson radical by yark
212. juxtaposition of automata by CWoo
213. KKM lemma by uriw
214. Klein 4-group by Algeboy
215. knot theory by CWoo
216. Krein-Milman theorem by jirka
217. Kurosh-Ore theorem by CWoo
218. Lasker-Noether theorem by CWoo
219. lattice filter by CWoo
220. lattice ideal by CWoo
221. lattice of projections by asteroid
222. lattice of topologies by CWoo
223. Lebesgue measure by bbukh
224. Lemoine circle by drini
225. Lemoine point by drini
226. level curve by pahio
227. limit of sequence of sets by CWoo
228. Lindenbaum-Tarski algebra by CWoo
229. linear algebra by rmilson
230. linear space and near-linear space by kshum
231. Lobachevsky's formula by vmoraru
232. locale by CWoo
233. locally closed by asteroid
234. locally testable by CWoo
235. logicism by gribskoff
236. magic circles by drini
237. Martin's axiom and the continuum hypothesis by Henry
238. Martin's axiom is consistent by mathcam
239. mathematics vocabulary by matte
240. matroid by mps
241. matroid independence axioms by sgraves
242. meet by yark
243. Monte Carlo methods by akrowne
244. Morley's theorem by drini
245. motivic cohomology by PrimeFan
246. motivic cohomology by CWoo
247. multiset by PrimeFan
248. natural number by djao
249. needle-in-the-haystack by Algeboy
250. no-arbitrage in the Black-Scholes pricing model by stevecheng
251. no-cycles condition by Koro
252. non-Euclidean geometry by Wkbj79
253. non-standard analysis by PrimeFan
254. nonempty perfect subset of $\mathbb{R}$ that contains no rational number, a by Gorkem
255. nonsingular variety by CWoo
256. normal closure by yark
257. normal curvatures by pahio
258. normal of plane by pahio
259. normal section by pahio
260. normal subgroup lattice is modular by CWoo
261. nullcline by Daume
262. ODE types reductible to the variables separable case by pahio
263. open set by mathwizard
264. ordered space by CWoo
265. orthogonal circles by pahio
266. parabola by mps
267. parallel and perpendicular planes by pahio
268. parallel lines in hyperbolic geometry by Wkbj79
269. parallelism of line and plane by pahio
270. parallellism in Euclidean plane by pahio
271. Pascal's mystic hexagram by drini
272. Pasch's theorem by CWoo
273. paved space by gel
274. pencil by CWoo
275. pencil of conics by pahio
276. perpendicular bisector by CWoo
277. perpendicularity in Euclidean plane by pahio
278. perspective drawing by stevecheng
279. perspectivity by CWoo
280. pi-system by drummond
281. pictures of Dynkin diagrams by Dr_Absentius
282. ping-pong lemma by uriw
283. Poincar\'e disc model by Wkbj79
284. Poincar\'e upper half plane model by Wkbj79
285. polarity by Algeboy
286. polygon by Mathprof
287. polyhedron by Mathprof
288. polynomial function is a proper map by joking
289. polynomials in algebraic systems by CWoo
290. polytope by mps
291. poset by mps
292. power of point by PrimeFan
293. prime radical by CWoo
294. principle of inclusion-exclusion, proof of by mps
295. product of automata by CWoo
296. product topology by CWoo
297. projection by rmilson
298. projection of point by pahio
299. projections of analytic sets are analytic by gel
300. projective line configurations by rspuzio
301. projective plane by yark
302. projective space by rmilson
303. proof of Banach-Steinhaus theorem by Koro
304. proof of Banach-Tarski paradox by GrafZahl
305. proof of Brouwer fixed point theorem by bwebste
306. proof of characterizations of the Jacobson radical by rspuzio
307. proof of Choquet's capacitability theorem by gel
308. proof of compact pavings are closed subsets of a compact space by gel
309. proof of countable unions and intersections of analytic sets are analytic by gel
310. proof of criterion for conformal mapping of Riemannian spaces by rspuzio
311. proof of delta system lemma by Henry
312. proof of downward Lowenheim-Skolem theorem by GodelsTheorem
313. proof of Egorov's theorem by Koro
314. proof of extending a capacity to a Cartesian product by gel
315. proof of Krein-Milman theorem by georgiosl
316. proof of Menelaus' theorem by mathwizard
317. proof of parallelogram theorems by rm50
318. proof of Pascal's mystic hexagram by mathcam
319. proof of pivot theorem by pbruin
320. proof of second isomorphism theorem for groups by yark
321. proof of the Burnside basis theorem by Algeboy
322. proof of triangle incenter by rm50
323. proof that a domain is Dedekind if its ideals are products of primes by gel
324. proof that every filter is contained in an ultrafilter by rspuzio
325. proof that forcing notions are equivalent to their composition by Henry
326. properties of ellipse by pahio
327. properties of functions by yark
328. properties of parabola by pahio
329. properties of parallel curves by pahio
330. properties of regular tetrahedron by pahio
331. properties of spanning sets by CWoo
332. quadratic inequality by pahio
333. quantifier algebra by CWoo
334. quotient of ideals by pahio
335. Radon's lemma by bbukh
336. rational transducer by CWoo
337. ray by CWoo
338. realization of a formula by a truth function by CWoo
339. reductio ad absurdum by gribskoff
340. regular polygon by Wkbj79
341. regular polygon and circles by pahio
342. relation algebra by CWoo
343. relation composition by Jon Awbrey
344. relationship among different kinds of compactness by rm50
345. relatively prime integer topology by mathcam
346. residual by mps
347. residually $\mathfrak{X}$ by yark
348. Riemann sphere by CWoo
349. ring hierarchy by Algeboy
350. ring of exponent by pahio
351. ring of sets by CWoo
352. root by mathcam
353. Runge's theorem by Koro
354. saturated (set) by drini
355. Scott continuous by CWoo
356. Scott topology by CWoo
357. secant line by Mathprof
358. semiprime ideal by antizeus
359. separated uniform space by CWoo
360. set by Mathprof
361. set theory by mathwizard
362. shuffle of languages by CWoo
363. Sierpi\'nski gasket by mathwizard
364. similitude of parabolas by pahio
365. simplest common equation of conics by pahio
366. slope by pahio
367. slope angle by Wkbj79
368. slope of a line is well-defined, proof that the by Dr_Absentius
369. spectral space by jocaps
370. stationary set by Henry
371. stereographic projection by GrafZahl
372. subanalytic set by jirka
373. subbasis by evin290
374. subgroups with coprime orders by pahio
375. submodule by PrimeFan
376. supplementary angles by pahio
377. supremum over closure by Wkbj79
378. surface of revolution by pahio
379. symmetric difference by CWoo
380. symmetric difference on a finite number of sets by CWoo
381. T1 space by drini
382. table of common logarithms by PrimeFan
383. tangent line by Mathprof
384. tangent plane (elementary) by rspuzio
385. Tarski-Seidenberg theorem by jirka
386. tetrahedron by rspuzio
387. theorem on constructible angles by Wkbj79
388. theory from orders of classical groups by Algeboy
389. theory of formal languages by rspuzio
390. three theorems on parabolas by CWoo
391. topic entry on axioms and foundations of homology and cohomology theories by bci1
392. topic entry on complex analysis by pahio
393. topics on low dimensional topology by juanman
394. transfinite derived series by yark
395. transversality by mathcam
396. trapezoid by Wkbj79
397. triangle center by mps
398. trigonometry by rm50
399. trisection of angle by Wkbj79
400. truncated cone by pahio
401. tube lemma by asteroid
402. tubular neighborhood by PrimeFan
403. uniform base by mathcam
404. uniform module by antizeus
405. universally measurable by gel
406. Van Kampen's theorem by RonaldBrown
407. Van Kampen's theorem result by mathcam
408. Venn diagram by CWoo
409. volume as integral by pahio
410. von Neumann-Bernays-G\"odel set theory by Aatu
411. weak-* topology by jirka
412. weakly compact cardinals and the tree property by Henry
413. zero by Mravinci
414. zero set of a topological space by CWoo