ALGEBRA GLOSSARY

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Title Description
Half-Life When some entity experiences exponential decay (reduction or diminution) the times it takes to lose half of its size (or strength) is its Half-Life.
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Harmonic A small integral multiple (or divisor) of a waveform is a harmonic.
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Height Altitude.
How tall something is, measured in some perpendicular fashion to the "bottom" is its height.
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Helix A straight line wrapped around a circular cylinder at some angle not perpendicular to the base of the cylinder results in a Helix.
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Heron's Formula A wonderful little recipe (algorithm) for finding the area of a triangle when sides are known and the altitude is not known, the formula is best expressed with a semiperimeter.
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Hexahedron A six-faced polyhedron is termed a Hexahedron.
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High Quartile The 75th percentile.
Also upper quartile.
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High Quintile The 80th percentile; upper quintile.
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Hole A missing element (typically a point) from an otherwise continuous function is called a Hole.
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Homogeneous Equations Homogeneous Equations have terms of like power or order.
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Horizontal Horizontal comes from orientation like the horizon; parallel to the "flat" surface of the earth; perpendicular to vertical.
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Hyperbola A conic section of specific mathematical relation to foci; its shape is the intersection of a double cone with a plane.
The difference between distances from a locus on the Hyperbola to the two foci is a constant.
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Hyperbolic Geometry Hyperbolic Geometry is non-Euclidean geometry; within it the Parallel Postulate does not hold.
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Hypotenuse The longest side of a right triangle is the Hypotenuse; it is always opposite the 90-degree angle (or right vertex).
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Hypothesis In a biconditional statement the hypothesis is followed by a conclusion.
In the scientific method, the hypothesis is the conjecture to be proved or disproved.
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