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2. Unimodular matrix - Wikipedia

   en.wikipedia.org/wiki/Unimodular_matrix

   A totally unimodular matrix (TU matrix) is a matrix for which every square non-singular submatrix is unimodular. Equivalently, every square submatrix has determinant 0, +1 or −1. A totally unimodular matrix need not be square itself. From the definition it follows that any submatrix of a totally unimodular matrix is itself totally unimodular ...

3. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   This picture shows clockwise from top left: An Arithmometer, a Comptometer, a Dalton adding machine, a Sundstrand, and an Odhner Arithmometer. A mechanical calculator, or calculating machine, is a mechanical device used to perform the basic operations of arithmetic automatically, or (historically) a simulation such as an analog computer or a ...

4. Scientific calculator - Wikipedia

   en.wikipedia.org/wiki/Scientific_calculator

   A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic ( addition, subtraction, multiplication, division) and complex ( trigonometric, hyperbolic, etc.) mathematical operations and functions. They have completely replaced slide rules as well as books of mathematical tables ...

5. Cryptosystem - Wikipedia

   en.wikipedia.org/wiki/Cryptosystem

   Cryptosystem. In cryptography, a cryptosystem is a suite of cryptographic algorithms needed to implement a particular security service, such as confidentiality ( encryption ). [1] Typically, a cryptosystem consists of three algorithms: one for key generation, one for encryption, and one for decryption. The term cipher (sometimes cypher) is ...

6. TEFC motor - Wikipedia

   en.wikipedia.org/wiki/TEFC_motor

   TEFC motor. A Totally Enclosed, Fan-Cooled ( TEFC) electric motor is a type of industrial electric motor with an enclosure that does not permit outside air to freely circulate through the interior of the motor. An external fan blows outside air over the frame of the motor to cool it. This motor is arguably the most commonly used motor in ...

7. Air lock - Wikipedia

   en.wikipedia.org/wiki/Air_lock

   Air lock. An air lock is a restriction of, or complete stoppage of liquid flow caused by vapour trapped in a high point of a liquid -filled pipe system. The gas, being less dense than the liquid, rises to any high points. This phenomenon is known as vapor lock, or air lock. Flushing the system with high flow or pressures can help move the gas ...