Real numbers

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IT IS ABOUT THE REAL NUMBERS
Aryan Bhatt
Mind Map by Aryan Bhatt, updated more than 1 year ago
Aryan Bhatt
Created by Aryan Bhatt over 3 years ago
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Real numbers
  1. Theorems
    1. Statement
      1. 1. Let p be a prime no. If p divides a² . Then p divides a,where a is a positive integer.
        1. 2. √2 is irrational
          1. 3. Let x be a rational no. Whose decimal expansion terminates . Then x can be expressed in the form of p/q, where p &q are co prime, the prime factorisation of q is of the form 2ⁿ, 5 raise to power m , where n,m are non- negative integers.
            1. 4. Let x = p/q be a rational number such that the prime factorisation of q is of the form 2ⁿ, 5 raise to power m . Where n, m are non - negative integers. Then x has a decimal expansion which terminates.
              1. 5. Let x =p/q be a rational number, such that the prime factorisation of q is not of the form of 2ⁿ5 raise to power m . Where n, m are non - negative integers. Then x has a decimal expansion which is non - terminating repeating.
    2. Euclid
      1. Given positive integers are a, b. There exist unique integers q and r. Satisfying a= bq +r ; 0 5 r < b
        1. Division algorithm.
          1. Steps to obtain the HCF of two positive integers. Say c and d, with c > d.
            1. Step 1- apply euclid division lemma, to c and d, c=dp +r.
              1. Step 2- if r = zero, d is the HCF of c and d. If r is not equal to zero, apply euclid division to d and r.
                1. Step 3- continue the process till the remainder is zero.
          2. Division lemma.
          3. Fundamental theorem of airthematic
            1. Every composite no. Can be expressed as a product of primes, and this factorisation is unique, apart from the order in which the prime factors occur
              1. Composite no. X=p₁*p₂*p₃..*p₄ where p₁p₂..px are prime no.
            2. prime factorisation method
              1. for any two positive inteɡers , a and b
                1. HCF (a,b)*LCM(a,b)=a*b
                  1. for example
                    1. f(x)=3x²y
                      1. ɡ(x)=6xy²
                        1. HCF=3xy
                          1. LCM=6x²y²
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