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A hyperbola consists of all points where the absolute difference of distances to two fixed points, called foci, remains constant. The standard equation isEach branch extends infinitely and approaches two asymptotes, which guide the curve’s behavior. The parameters a and b define key features: a measures the distance from the center to each vertex along the transverse axis, while b influences the slopes of the asymptotes. The asymptotes have equationsA rectangle centered at the origin with...
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Graphs of Polar Equations01:17

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The polar coordinate system represents points using a distance from a central point (the pole) and an angle from a reference direction (the polar axis). Unlike rectangular coordinates, polar coordinates are ideal for graphing curves with radial symmetry or periodic behavior.Some general forms of graphs in polar coordinates include the following:Equation of a Circle (Centered at the Pole):A graph where the radius remains constant for all angles traces a circle centered at the pole:Equation of a...
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Graphs of functions provide a visual representation of how output values change in response to varying inputs. Each point on the graph corresponds to an ordered pair, where the x-coordinate (independent variable) determines the horizontal position and the y-coordinate (dependent variable) determines the vertical position. Linear functions like y = x give a straight line, indicating a constant rate of change.Nonlinear functions display more complex behaviors. Even power functions generate...
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Hyperbolas01:30

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A hyperbola is a conic section produced when a double-napped cone is intersected by a plane at an angle steeper than the slope of the cone, such that it cuts through both nappes. This intersection yields two separate, mirror-image curves known as branches, which open away from each other along the transverse axis. The nearest points on each branch to the hyperbola’s center are termed vertices, and the distance from the center to a vertex is denoted by a. Perpendicular to the transverse...
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Piecewise defined functions are mathematical models where different expressions define a function over distinct intervals of the domain. These functions are useful for representing systems with varying behaviors depending on input values.For example, the function:  uses a linear rule for inputs less than or equal to –1 and a quadratic rule for values greater than –1. Although it has two formulas, it still defines a single function.Another common type is the absolute value...
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Updated: Jan 8, 2026

Automated Charting of the Visual Space of Housefly Compound Eyes
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Colored HOMFLYPT counts holomorphic curves.

Tobias Ekholm1,2, Vivek Shende3,4

  • 1Department of Mathematics and Centre for Geometry and Physics, Uppsala University, Uppsala 751 06, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|December 12, 2025
PubMed
Summary

This study connects link invariants to holomorphic curve counts in a Calabi-Yau threefold. The findings generalize previous work, revealing a skein-valued formula for annulus surfaces.

Keywords:
Gromov–Witten theoryHOMFLYPTholomorphic curveknot theory

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Area of Science:

  • Topology
  • String Theory
  • Algebraic Geometry

Background:

  • Lagrangian conormals of links in the three-sphere can be mapped to the resolved conifold, a noncompact Calabi-Yau threefold.
  • Previous work established a link between curve counts and HOMFLYPT invariants for the uncolored case.

Purpose of the Study:

  • To demonstrate that the count of holomorphic curves ending on a transplanted Lagrangian conormal in the resolved conifold corresponds to HOMFLYPT invariants of all link colorings.
  • To generalize the identification of curve counts with link invariants to colored links.

Main Methods:

  • Transplanting Lagrangian conormals to the resolved conifold.
  • Developing a skein-valued multiple cover formula for isolated embedded annuli.
  • Utilizing string theoretic predictions by Ooguri and Vafa.

Main Results:

  • The count of all holomorphic curves in the resolved conifold ending on the transplanted Lagrangian is equivalent to the collection of HOMFLYPT invariants for all link colorings.
  • This result generalizes the previously identified curve count for uncolored links.

Conclusions:

  • The study provides a comprehensive framework connecting knot theory (HOMFLYPT invariants) with geometric concepts (holomorphic curves in Calabi-Yau manifolds).
  • The developed skein-valued multiple cover formula is a key tool for understanding these connections.