In math (linear algebra and geometric transformations), a horizontal shear is a type of linear transformation that keeps the area of a shape the same but slants it horizontally. The main feature is that each point’s y-coordinate stays the same, while the x-coordinate shifts proportionally based on the y value.
A private key isn't just a random number mathematically; it's a specific integer or vector generated based on a one-way trapdoor function. The core math property is computational irreversibility: it's easy to derive the public key from the private key, but you can't reverse it to get the private key from the public key in polynomial time.
Astronomy mainly studies celestial bodies in outer space, the structure and development of the universe, including the positions, structures, properties, and movement patterns of these bodies.
A quadrilateral is a closed flat shape formed by connecting four line segments end to end, and it's one of the most basic geometric shapes in math.
Quadrilaterals are mainly divided based on the parallel relationships of their sides into parallelograms, trapezoids, and general quadrilaterals, with parallelograms including rectangles, rhombuses, and squares.
Adjacent angles in a quadrilateral are the two angles that share a side. The feature of adjacent angles is that their sum equals 180 degrees. For any quadrilateral, whether it's a rectangle, square, or parallelogram, the sum of adjacent angles is always 180 degrees.
Rounding is a way to adjust numbers. The rule is if the last digit is 4 or less, you just drop it; if it's 5 or more, you round up.
(Social problem) is one of the important areas of sociological research. It affects the healthy lives of society members, hinders social harmony, and is a social disorder phenomenon that catches widespread public attention.