# Jordan Curve

If is a simple closed curve in then the Jordan curve theorem also called the Jordan-Brouwer theorem Spanier 1966 states that has two components an inside and outside with the boundary of each. Due to the importance of the Jordan curve theorem in low-dimensional topology and complex analysis it received much attention from prominent mathematicians of the first half of the 20th century.

### 22 Parity Function for Polygons The Jordan curve theorem for polygons is well known.

Jordan curve. Recall that a Jordan curve is the homeomorphic image of the unit circle in the plane. γ0and γ1 are called the endpoints of curve α. It is one of those geometri-cally obvious results whose proof is very diﬃcult.

Its length may be finite or infinite. Jordan Curve Theorem Any continuous simple closed curve in the plane separates the plane into two disjoint regions the inside and the outside. The usual game to play with Jordan curves is to draw some horrible mess like the above then pick a point in the middle of it off of the curve and try to figure out if the point lies.

X2y2 1 separates the plane into. Jordan curve theorem in topology a theorem first proposed in 1887 by French mathematician Camille Jordan that any simple closed curvethat is a continuous closed curve that does not cross itself now known as a Jordan curvedivides the plane into exactly two regions one inside the curve and one outside such that a path from a point in one region to a point in the other. Jordan curve – a closed curve that does not intersect itself.

Similarly a closed Jordan curve is an image of the unit circle under a similar mapping and an unbounded Jordan curve is an image of the open unit interval or of the entire real line that separates the plane. A curve is closed if its ﬁrst and last points are the same. Jordan Curve Theorem A Jordan curve in.

For a long time this result was considered so obvious that no one bothered to state the theorem let alone prove it. A Jordan arc or simple arc is a subset of R2 homeomorphic to a closed line segment in R. A conformal map φ of a Jordan domain F onto a Jordan domain G can be extended to a homeomorphism of F onto G.

The Jordan Curve Theorem will play a crucial role. The Jordan curve theorem is deceptively simple. Closed curve – a curve such as a circle having no endpoints.

X 01 where γ 01 IR2 is a continuous mapping from the closed interval 01to the plane. A polygon is a Jordan curve that is a subset of a ﬁnite union of lines. A choice of homeomorphism gives a parameterization of the Jordan curve or arc α01 R2 as the composite of the homeomorphism fS1 CR2.

E Aii exactly one of r as has bounded complement. Simple closed curves in the plane are also called Jordan curves. Various proofs of the theorem and its generalizations were constructed by J.

Openness of r 0. I If E I-. A curve is simple if it has no repeated points.

The document has moved here. Cal theorems of mathematics the Jordan curve theorem. We will only need a weak.

Lemma 41 i Bd roC r for all a. It states that a simple closed curve ie a closed curve which does not cross itself always separates the plane E2 into two pieces. A Jordan curve is a plane curve which is topologically equivalent to a homeomorphic image of the unit circle ie it is simple and closed.

Jordan Curves A curve is a subset of IR2 of the form α γx. Handbook of Computational Geometry 2000. A Jordan curve Γ is said to be a Jordan polygon if there is a partition Θθθ θ 01 n of the interval 02π ie 02.

A Jordan curve divides the plane into two regions having the curve as. In topology a Jordan curve sometimes called a plane simple closed curve is a non-self-intersecting continuous loop in the plane. In the southwest it has a 26 km 16 mi coastline on the Gulf of Aqaba in the Red Sea.

It is not known if every Jordan curve contains all four polygon vertices of some square but it has been proven true for sufficiently smooth curves and closed convex curves Schnirelman. One source of such curves is simple closed approximations of space-filling curves like the one in the post on monsters. A Jordan curve is said to be a Jordan polygon if C can be covered by finitely many arcs on each of which y has the form.

An intuitively obvious but very difficult to prove theorem follows. Loop – anything with a round or oval shape formed by a curve that is closed and does not intersect itself. Jordan Curve Theorem.

It is a polygonal arc if it is 11. Assures us that A is a countable set. THE JORDAN CURVE THEOREM 1.

A manifold with boundary of dimension 1 is a Hausdor sec-. See also Line curve. It bounds two Jordan domains.

Any continuous closed curve that does not intersect itself. For example it is easy to see that the unit cir cle 8 1 xiy E C. Also called a simple closed curve.

By Jordan curve we mean the homeomorphic image of T. A Jordan curve or simple closed curve is a subset C of R2 that is homeomorphic to a circle. Proof of Jordan Curve Theorem Let f be a simple closed curve in E2 and r OOEA be the components of E2 – r.

According to the de nition a manifold of dimension 1 is a Hausdor second count-able space Xso that any x2Xadmits an open neighborhood Uthat is homeomorphic to the interval 01. Jordan is bordered by Saudi Arabia to the south and east Iraq to the northeast Syria to the north and Israel the Palestinian West Bank and the Dead Sea to the west. A complete proof can be found in.

01 R2 that is a subset of a ﬁnite union of lines. Jordan who suggested the definition. Ycost sint Xt fi pt a with constants H pa.

Now as r is topologically closed each r 0. The theorem states that every continuous loop where a loop is a closed curve in the Euclidean plane which does not intersect itself a Jordan curve divides the plane into two disjoint subsets the connected components of the curves complement a bounded region inside the curve and an unbounded region outside of it each of which has the original curve as its boundary. Alexander Louis Antoine Bieberbach Luitzen Brouwer Denjoy Hartogs Kerékjártó Alfred.

The Jordan curve theorem is a standard result in algebraic topology with a rich history. A polygonal path is a continuous function P. Arc and Jordan curve Arc and Jordan curve.

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