It is a member of the conchoid of de Sluze family of curves and in form it resembles a tractrix.

The conchoid ( s ) of de Sluze is a family of plane curves studied in 1662 by René François Walter, baron de Sluze.

Conchoidal fractures often result in a curved breakage surface that resembles the rippling, gradual curves of a mussel shell ; the word " conchoid " is derived from the word for this animal ( Greek konche ).

This and several other propositions on contact, e. g. cases of circles touching one another and inscribed in the figure made of three semicircles and known as arbelos (" shoemakers knife ") form the first division of the book ; Pappus turns then to a consideration of certain properties of Archimedes's spiral, the conchoid of Nicomedes ( already mentioned in Book I as supplying a method of doubling the cube ), and the curve discovered most probably by Hippias of Elis about 420 B. C., and known by the name, τετραγωνισμός, or quadratrix.

* The conchoid of a circle with respect to a point on the circle is a limaçon.

A conchoid is a curve derived from a fixed point O, another curve, and a length d.

The conchoid is, therefore, the cissoid of a circle with center O and the given curve.

The prototype of this class is the conchoid of Nicomedes in which the given curve is a line.

A limaçon is a conchoid with a circle as the given curve.

When C < sub > 1 </ sub > is a circle with center O then the cissoid is conchoid of C < sub > 2 </ sub >.

Other more complicated methods of doubling the cube involve the cissoid of Diocles, the conchoid of Nicomedes, or the Philo line.

* The conchoid of Nicomedes, studied by Nicomedes as a method to both double the cube and to trisect an angle.

For every line through O that intersects the given curve at A the two points on the line which are d from A are on the conchoid.

If expresses the given curve then r = α ( θ ) ± d expresses the conchoid.

Van Schooten's father was a professor of mathematics at Leiden, having Christiaan Huygens, Johann van Waveren Hudde, and René de Sluze as students.

* François Walther de Sluze ( 1622 – 1685 ), mathematician and abbot of Amay

The Conchoid of de Sluze for several values of a

ca: Concoide de De Sluze

de: Konchoide von de Sluze

* The cissoid of the circle and the line, where k is a parameter, is called a Conchoid of de Sluze.

René-François Walter de Sluse ( Renatius Franciscus Slusius, also Walther de Sluze ), canon of Liège and abbot of Amay ( 2 July 1622 – 19 March 1685 ) was a Walloon mathematician.

René François Walther de Sluze ( Slusius ).

The Conchoid of de Sluze is named after him.

de: René François Walther de Sluze

es: René de Sluze

The curve is therefore a member of the Conchoid of de Sluze family.

The Venetian artist Jacopo de ' Barbari, whom Dürer had met in Venice, visited Nuremberg in 1500, and Dürer said that he learned much about the new developments in perspective, anatomy, and proportion from him.

File: Albrecht Dürer Saint Jerome 1521. jpg | Saint Jerome, 1521, Museu Nacional de Arte Antiga, Lisbon

de: Albrecht Dürer

" His models were niellos and copper engravings from the workshops of Jacopo de Barbari and Albrecht Dürer.

de: Hans Dürer

He is known to have been active, and already well-established, in Augsburg from c. 1516, where he was working, and signing the reverse of blocks, under Jost de Negker, the other great blockcutter of the period, on the print projects for Maximilian I, Holy Roman Emperor involving Albrecht Dürer, Hans Burgkmair and other artists.

But there is nothing we can do to stop Soviet Russia from granting de facto recognition to East Germany.

A trial de novo is usually available for review of informal proceedings conducted by some minor judicial tribunals in proceedings that do not provide all the procedural attributes of a formal judicial trial.

* Brasil, Rio Grande do Sul-Associação dos Amigos, Parentes e Portadores de Ataxias Dominantes

gl: Arco do Triunfo de París

On this ship he took a detachment of troops from Rio de Janeiro to Colonia do Sacramento on the Rio de la Plata ( opposite Buenos Aires ) to relieve the garrison there.

The earlier date, 293, is sometimes assigned and apparently supported by the authority of a " Coptic Fragment " ( published by Dr. O. von Lemm among the Mémoires de l ' académie impériale des sciences de S. Péterbourg, 1888 ) and corroborated by the maturity revealed in his two earliest treatises Contra Gentes ( Against the Heathens ) and De Incarnatione ( On the Incarnation ), which were admittedly written about the year 318 before Arianism had begun to make itself felt, as those writings do not show an awareness of Arianism.

Attractions near Aveiro include the Ílhavo ceramica de Vista Alegre and the beaches of Barra, Costa Nova do Prado, and Gafanha da Nazare.

Each of the seven military commands has its headquarters in a major city: Eastern Military Command ( Comando Militar do Leste-CML ), Rio de Janeiro ; Southeastern Military Command ( Comando Militar do Sudeste-CMSE ), São Paulo ; Southern Military Command ( Comando Militar do Sul-CMS ), Porto Alegre ; Northeastern Military Command ( Comando Militar do Nordeste-CMN ), Recife ; CMO, Campo Grande ; CMP, Brasília ; and CMA, Manaus.

Between 1992 and 2008, the 1st, 2nd and 16th Jungle Infantry Brigades, the 3rd Infantry Battalion, the 19th Logistics Battalion, and the 22nd Army Police Platoon were transferred by the Army from the states of Rio de Janeiro and Rio Grande do Sul to the Amazon region in accordance with the friendship policy with Argentina.

Also relocated from the state of Rio de Janeiro were the 1st and 3rd Combat Cars Regiment, now stationed in the city of Santa Maria, in the state of Rio Grande do Sul.

pt: Experiência do balde de Newton

* Festival Internacional do Mundo Celta de Ortigueira ( Ortigueira, Galicia ) ( Spain )

There are very small harbors, with protective breakwaters, essentially used by fishing boats at Tarrafal on Santiago, Pedra de Lume on Sal and Ponta do Sol on Santo Antão.

pt: Ilhas do Mar de Coral

From the peak's platform the panoramic view includes downtown Rio, Sugarloaf Mountain, the Lagoa Rodrigo de Freitas ( lake ), Copacabana and Ipanema beaches, Estádio do Maracanã ( Maracanã Stadium ), and several of Rio's favelas.

Weak states are given de jure sovereignty equal to that of other states, even when they do not have de facto sovereignty or control of their own territory, including the privileges of international diplomatic recognition and an equal vote in the United Nations.

pt: Objeto clássico do cinturão de Kuiper

There, in October or November, 1485, near the falls of Ielala, he left an inscription engraved on the stone which testifies of its passage and that of his men: " Aqui chegaram os navios do esclarecido rei D. João II de Portugal-Diogo Cão, Pero Anes, Pero da Costa.

* António José da Silva – writer of Vida do Grande Dom Quixote de la Mancha e do Gordo Sancho Pança ( 1733 )