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By Ladislav Nebeský

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Write the temperature in degrees Celsius as a function of degrees Fahrenheit. 3 Originally, it was called degrees Centigrade. centi because there are 100 degrees between the two calibration points. It is now called degrees Celsius in honor of the inventor. 4 The Fahrenheit scale, named for Daniel Fahrenheit, was originally calibrated with the freezing point of salt-saturated water to be 0◦ . Later, the calibration points became the freezing point of water, 32◦ , and body temperature, 96◦ . With this method, there are 64 divisions between the calibration points.

An1 · · · ann xn bn This takes much less space when we use the summation convention. aij xj = bi Here j is a summation index and i is a free index. 3 The Dot and Cross Product Dot Product. The dot product or scalar product of two vectors is defined, a · b ≡ |a||b| cos θ, where θ is the angle from a to b. From this definition one can derive the following properties: • a · b = b · a, commutative. • α(a · b) = (αa) · b = a · (αb), associativity of scalar multiplication. • a · (b + c) = a · b + a · c, distributive.

We can write out the matrix and vectors explicitly.      a11 · · · a1n x1 b1  ..   ..  =  ..  .  . .  .   .  an1 · · · ann xn bn This takes much less space when we use the summation convention. aij xj = bi Here j is a summation index and i is a free index. 3 The Dot and Cross Product Dot Product. The dot product or scalar product of two vectors is defined, a · b ≡ |a||b| cos θ, where θ is the angle from a to b. From this definition one can derive the following properties: • a · b = b · a, commutative.

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