Difference between revisions of "Tacnode"
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''point of osculation, osculation point, double cusp'' | ''point of osculation, osculation point, double cusp'' | ||
| − | The third in the series of | + | The third in the series of $A_k$-curve singularities. The point $(0,0)$ is a tacnode of the curve $X^4-Y^2=0$ in $\mathbf R^2$. |
| − | The first of the | + | The first of the $A_k$-curve singularities are: an ordinary double point, also called a node or crunode; the cusp, or spinode; the tacnode; and the ramphoid cusp. |
| − | They are exemplified by the curves | + | They are exemplified by the curves $X^{k+1}-Y^2=0$ for $k=1,2,3,4$. |
The terms "crunode" and "spinode" are seldom used nowadays (2000). | The terms "crunode" and "spinode" are seldom used nowadays (2000). | ||
Latest revision as of 13:06, 23 July 2014
point of osculation, osculation point, double cusp
The third in the series of $A_k$-curve singularities. The point $(0,0)$ is a tacnode of the curve $X^4-Y^2=0$ in $\mathbf R^2$.
The first of the $A_k$-curve singularities are: an ordinary double point, also called a node or crunode; the cusp, or spinode; the tacnode; and the ramphoid cusp.
They are exemplified by the curves $X^{k+1}-Y^2=0$ for $k=1,2,3,4$.
The terms "crunode" and "spinode" are seldom used nowadays (2000).
References
| [a1] | A. Dimca, "Topics on real and complex singularities" , Vieweg (1987) pp. 175 MR1013785 Zbl 0628.14001 |
| [a2] | R.J. Walker, "Algebraic curves" , Princeton Univ. Press (1950) (Reprint: Dover 1962) MR0033083 Zbl 0039.37701 |
| [a3] | Ph. Griffiths, J. Harris, "Principles of algebraic geometry" , Wiley (1978) pp. 293; 507 MR0507725 Zbl 0408.14001 |
| [a4] | S.S. Abhyankar, "Algebraic geometry for scientists and engineers" , Amer. Math. Soc. (1990) pp. 3; 60 MR1075991 Zbl 0709.14001 Zbl 0721.14001 |
How to Cite This Entry:
Tacnode. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Tacnode&oldid=23988
Tacnode. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Tacnode&oldid=23988
This article was adapted from an original article by M. Hazewinkel (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article