103 results for “ear”
Equation of a straight line.
Line through a point with a given slope.
Cramer-rule solution for two simultaneous equations.
Measures linear correlation between two variables.
The value that appears most often in a data set.
Rectified Linear Unit: outputs the input if positive, else zero.
Determinant of a 2×2 matrix.
Scalar product of two vectors.
Magnitude of the vector perpendicular to two vectors.
Length of a vector.
Defines eigenvalues and eigenvectors of a matrix.
Inverse of a 2×2 matrix (ad−bc ≠ 0).
Sum of the diagonal entries of a square matrix.
Projection of vector a onto vector b.
Matrices of equal size add entry by entry.
Multiply every entry of a matrix by a scalar.
The identity matrix leaves any matrix unchanged under multiplication.
Reflects a matrix across its main diagonal.
Determinant of a 3×3 matrix by cofactor expansion.
Sum of componentwise products of two vectors.
Angle from the dot product and magnitudes.
Volume of the parallelepiped spanned by three vectors.
Multiplying by the identity leaves a matrix unchanged.
The transpose of a product reverses the order.
Relates rank and null space dimension to columns.
Product of two 2×2 matrices.
Vector of length one in the same direction.
The determinant of a product is the product of determinants.
Gravitational force on a mass near Earth.
Rotational analog of linear momentum.
Length change of a solid when heated.
Speed depends on tension and linear density.
Momentum at speeds near light.
Number of nuclei remaining over time.
Time for half a sample to decay.
Decays per second in a sample.
Energy holding a nucleus together.
How much larger an image appears than the object.
Blood pumped by the heart per minute.
Estimated maximum heart rate by age.
Training heart rate at intensity I.
Heart-rate-corrected QT interval from an ECG.
Kidney function estimate (men; ×0.85 for women).
A more accurate maximum heart rate estimate.
The usable range between rest and maximum heart rate.
Heart-rate-corrected QT interval using a cube root.
Distance light travels in a given time.
Change in length due to temperature change.
Ratio of teeth (or speeds) between gears.
Non-dimensional lift, obtained by rearranging the lift equation.
Shortest distance between two points on the Earth for long-range navigation.
Interest earned on principal at a simple rate.
Value of principal compounded n times per year.
Approximate years to double an investment.
True annual rate accounting for compounding.
Share price relative to earnings per share.
Company profit allocated to each share.
The “bottom line” — total earnings after all expenses, interest and taxes are deducted from revenue.
Cumulative profit kept in the business rather than paid out to shareholders.
Earnings before interest, taxes, depreciation and amortization — a proxy for core operating cash generation.
An accelerated depreciation method charging more expense in an asset’s early years.
Accumulated profit kept in the business.
Measures price levels relative to a base year.
Interest earned or owed without compounding.
Tests whether a Gregorian year has 366 days.
Whole years elapsed since a birth date.
Earth's rotation period measured against the stars, not the Sun.
ISO-8601 week of the year (weeks start on Monday).
Day-of-year number (1–366) for a given date.
Great-circle distance between two lat/long points.
Ratio of map distance to real-world distance.
Steepness of terrain as a percentage.
Approximate drop of the horizon over distance d.
Atmospheric pressure as a function of altitude.
Approximate ground distance per degree of latitude.
Earthquake magnitude from seismograph amplitude.
Number of people per unit area.
Each 15 degrees of longitude equals one hour.
Energy released by a quake of Richter magnitude M.
Modern magnitude from the seismic moment of a quake.
Speed of an elastic wave through rock.
Pressure from the weight of overlying rock.
Temperature rise with depth into the Earth.
Speed of a shallow-water wave across the ocean.
Age of a rock from parent and daughter isotopes.
Fundamental electromagnetic resonance of the Earth.
Depth of a mountain's crustal root floating in the mantle.
Rate of groundwater flow through porous rock.
Amount remaining after a number of half-lives.
Population growth that slows as it nears carrying capacity.
Fraction of solar radiation reflected by a surface.
Approximate energy released by an earthquake.
Runtime of efficient comparison sorts.
A Vedic sutra for multiplying numbers close to a base (10, 100, 1000, etc.). Works by finding how far each number is from the base.
Quick method to square any number near 50 using the identity (50±d)² = 2500 ± 100d + d².
Use the identity (a+b)(a-b) + b² = a² to square numbers quickly by going to the nearest easy number.
When numbers are near a convenient working base that is a multiple of a power of 10, use a proportional base to simplify the multiplication.
For numbers a little above 100, use the surplus from 100 to multiply almost instantly.
Estimate how many years it takes an investment to double: divide 72 by the annual interest rate.