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Aristotle's axiom is weaker than the parallel postulate.
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A rotating shaft unbalanced by two attached weights.
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Possible spin angular momentum values for 1/2 spin particles.
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Force diagram in co-rotating frame for water surface in rotating bucket.
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Conjugate poles in left s-plane.
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A coelomate animal is essentially a set of concentric tubes.
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Payment streams represented by actuarial notation for annuities of term n.
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Current continuity in capacitor using displacement current.
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Hemispherical dome that appears alongside other dome designs.
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Vectors showing relation between an object's proper motion and its velocity.
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The dihedral angle (red) is between two half-planes (blue).
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Grass flower with vestigial perianth, also known as lodicules.
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An illustration of message collision in multiaccess channels.
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An illustration of the generalised binary splitting algorithm.
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An illustration for a common
Group testing problem.
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Symbol for a royal knight used in chess variant games.
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Icon of a fairy chess piece used in chess variant games.
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Illustration showing the
semi-major axis of an ellipse.
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Operation Uranus Deception German View 18 Nov 1942 (1989).
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Actual Soviet Dispositions with subsequent attacks (1942).
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Forces on rotating spheres tied with string with angular velocity ω.
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Rotating spheres tied with string with angular velocity ω.
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A point in spherical coordinates has a latitude φ and longitude ω.
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A
stereographic projection from the north pole onto a plane below the sphere.
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See
File:Line elements.svg for how not to do an SVG conversion.
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Wasps are paraphyletic, consisting of the Apocrita without Ants and Bees.
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Diagram explaining
Path integration, core function of
Animal navigation.
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An attacker remains on a line between the target and the start.
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Whales are paraphyletic with respect to the dolphins and porpoises.
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Dazzle camouflage is meant to cause the enemy to take up a poor position.
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The structures that provide structural coloration in Papilio palinurus.
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The reflectors are oriented nearly vertically to provide effective camouflage.
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Dispersal of melanophores controls colour change in fish and frogs.
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A flanged body or a camouflage net helps to hide a shadow.
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Countershading acts as a form of camouflage with a flat appearance.
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Archimedes' considered the smallest cylinder containing a sphere.
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An animation of a solution to the false coin problem, a group-tesing problem.
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An illustration of the COMP algorithm. This one correctly labels a and b.
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A non-adaptive
group testing setup.
y contains the result of each test.
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llustration of the unit circle, showing the direction of positive / negative angles.
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Illustration of a vector field, called
F, over a surface, called

.
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Illustration of the projected orbit of the meteorite Neuschwanstein.
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A shape can be made more round while keeping its perimeter fixed.
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An illustration of the inverse of a circle not passing through O.
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An illustration of the inverse of a circle passing through O.
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Illustration of the vectors involved in the parallelogram law.
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Illustration of a convex set containing the two points X and Y.
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Illustration of a concave set containing the two points X and Y.
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Diagram illustrating a change in order of integration.
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Lattice of Gaussian integers in the complex plane. The point 3+2i is also displayed.
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Astronomical diagram describing altitude and azimuth.
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Diagram illustrating the dot and cross products together.
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The Pythagorean Theorem using regular pentagons on each side.
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A generalisation of Pythagoras to 3 dimensions (Brews Ohare).
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Generalization of Pythagoras's theorem by Tâbit ibn Qorra.
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Construction to generalise Pythagoras' theorem to arbitrary triangles.
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Generalisation of Pythagoras' theorem to scalene triangle.
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Illustration of the vectors involved in the parallelogram identity.
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An illustration of the central angle, Δσ, between two points.
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The separation s of two points (r1, θ1) and (r2, θ2) in polar coordinates.
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Components of
proper motion. The celestial north pole is CNP.
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Euclid's construction for square roots of integers (
Pythagorean theorem).
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A proof for Pythagoras' theorem using similar triangles.
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Pythagoras' applied to similar triangles on the sides of a right triangle.
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Similar right triangles showing the sec and tan trig functions.
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Similar triangles showing sine and cosine (
Trigonometric identity)
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Third illustration of a series on Euclid's proof of
Pythagoras' theorem.
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Diagram illustrating the
eccentric and
true anomalies of an ellipse
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Geometric construction for Kepler's calculation of θ. (
Kepler's laws)
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Diagram of simple slope correction in surveying (
Tape correction).
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An example of connected directed network with two components (shaded).
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An example of disconnected directed network with sections shaded.
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A diagram illustrating
great-circle distance (drawn in red).
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A small network with both multiedges and self-edges (Newman, Mark E. J.).
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Structural formula of the chemical compound
1-methylindole
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Derivation involving
atan2.