Probability of Empty Intersection of Randomly Chosen Planes?

In summary, the intersection of random planes refers to the point or line where two or more planes intersect each other in three-dimensional space. This intersection can vary in dimension, from a point to a line. It can be calculated by solving the system of equations that represent the planes, and it is possible for the intersection to be empty if the planes are parallel. The intersection has various applications in mathematics, physics, engineering, 3D graphics, and computer-aided design. Real-world examples include the intersection of walls and roads, as well as its use in architecture, aviation, and surveying.
  • #1
Dragonfall
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Let [itex]x \in \{-1, 1\}^n[/itex] and let [itex]p(x) = \{w \in \mathbb{R}^n : x \cdot w > 1\}[/itex]. What is the probability that [itex]p(x_1) \cap \ldots \cap p(x_{n+1}) = \emptyset[/itex] given that [itex]x_i[/itex] are chosen uniformly at random?
 
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  • #2
##p(x)## is not a plane. It is a half-space. If you insist on the symbolical formulation, then the question boils down to the probability of having at least two vectors in ## \{ x_1, \ ... \ , x_{n + 1} \} ## that are anti-parallel.
 
  • #3
No, it's possible to have empty intersection without a pair of opposite vectors.
 

1. What is the intersection of random planes?

The intersection of random planes refers to the point or line where two or more planes intersect each other in three-dimensional space. This intersection can vary in dimension, from a point (if the planes intersect at a single point) to a line (if the planes intersect along a common line).

2. How is the intersection of random planes calculated?

The intersection of random planes can be calculated by solving the system of equations that represent the planes. This involves finding the values of the variables that satisfy all the equations simultaneously. The solution(s) will give the coordinates of the intersection point or the direction vector of the intersection line.

3. Can the intersection of random planes be empty?

Yes, it is possible for the intersection of random planes to be empty. This occurs when the planes are parallel to each other and do not intersect at any point. In this case, the system of equations representing the planes has no solution, and the intersection is considered empty.

4. What is the significance of the intersection of random planes?

The intersection of random planes has various applications in mathematics, physics, and engineering. It is used in solving systems of linear equations, finding the shortest distance between two skew lines, and determining the angle between two planes. It is also essential in 3D graphics and computer-aided design.

5. Are there any real-world examples of the intersection of random planes?

Yes, there are many real-world examples of the intersection of random planes. For instance, the intersection of two walls in a room forms a line, and the intersection of two roads forms a point. In architecture, the intersection of two walls or roofs can create interesting geometric patterns. The concept is also used in aviation to calculate the intersection of flight paths and in surveying to determine the location of a point using triangulation.

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