Illustrated Maths Dictionary Illustrated Maths Dictionary 212 positive numbers(abbreviated “+ve”)greater than zero. (Negative means less than zero. Zero is neither negative nor positive.) Example: 5 is positive five. -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 23 Negative numbers Origin 4 5 6 7 8 9 10 Positive numbers postulate a statement, also known as an axiom, which is taken to be true without proof. Postulates are the basic structure from which lemmas and theorems are derived. The whole of Euclidean geometry, for example, is based on five postulates known as Euclid’s postulates. poundal a unit of force equal to the force that imparts an acceleration of 1 foot/sec2 to a mass of 1 pound; equal to 0.1382 newtons. power is an abbreviated form of writing a multiplication formed by several equal factors. Take 7 x 7 x 7 x 7 = 74 so * Base The base of a power is the number that multiplies by itself, in this case, 7. * Exponent. The exponent of a power indicates the number of times to multiply the base by itself, in this case, 4. power function a function of the form, ƒ:x cxr c, r ∈R, where c and r are constant real numbers and x is a variable. The domain of a power function can sometimes be all real numbers, but generally a non-negativity x≥0 is used to avoid problems with simplifying. The domain of definition is determined by each individual case. power function. 2 f (x) = x h (x) = x 3 p (x) = x5 -1.5 -1 -0.5 2 5 5 1 1 0.5 0.5 0 0 0.5 1 1.5 -1.5 -1 -0.5 -1 -1.5 0 -0.5 0 0.5 1 1.5 -0.5 k (x) = x4 g (x) = x2 q (x) = x6 -1 -1.5 -2 -2 Power functions with r=1,3 and 5 Power functions with r=2,4 and 6. power set “The set of all the subsets of a set”. If we have a set {a,b,c}: * These are some subsets: {a}, {b} and {c} * And these are subsets: {a, b}, {a, c} and {b, c}, * And {a,b,c} is also a subset of {a,b,c} * And the empty set {} is also a subset of {a,b,c} 213 P So all the subsets together make the Power Set: P(S) = { { }, {a}, {b}, {c}, {a, b}, {a, c}, {b, c}, {a, b, c} }. power of a number means how many times to use the number in a multiplication. It is written as a small number to the right and above the base number. In this example: 82 = 8 × 8 = 64. (Another name for power is index or exponent) See exponents. precision how close measured values are to each other. 1.low accuracy high precition 2. high accuracy low precition accurate and precise precise, but not accurate 3.high accuracy high precition not accurate not precise predecessor the predecessor of a whole number is one less than the given number. Clearly, the predecessor of 1 is 0; predecessor of 2 is 1; predecessor of 3 is 2 and so on. The whole number 0 does not have any predecessor. We observe that every whole number, other than zero, has its predecessor. Also, if ‘a’ is the successor of b, then ‘b’ is the predecessor of ‘a’. For example: The predecessor of 99999 is (99999 - 1) = 99998 and The predecessor of 11999 is (11999 - 1) = 11998. prefix a word, letter, or number placed before another. Example: one millimetre means one thousanth of a metre prime factor of a number a factor that is a prime number: one of the prime numbers that, when multiplied, give the original number. Example: The prime factors of 15 are 3 and 5 (3×5=15, and 3 and 5 are prime numbers). prime factorization to decompose a number into factors, make successive divisions among its prime divisors until one is obtained 36 as the quotient. To make the divisions, use x 4 9 a vertical bar. On the right side of the line, write the prime divisors and to the left, the 3 x 3 2 x 2 quotients. The prime factorization 36 is : 2 x 2 x 3 x 3 = 36