Download Mathematical problems and proofs : combinatorics, number by Branislav Kisacanin PDF

By Branislav Kisacanin

A gradual advent to the hugely subtle global of discrete arithmetic, Mathematical difficulties and Proofs offers themes starting from easy definitions and theorems to complex themes -- comparable to cardinal numbers, producing capabilities, homes of Fibonacci numbers, and Euclidean set of rules. this glorious primer illustrates greater than one hundred fifty strategies and proofs, completely defined in transparent language. The beneficiant old references and anecdotes interspersed through the textual content create fascinating intermissions that will gas readers' eagerness to inquire extra in regards to the themes and a few of our best mathematicians. the writer courses readers via the method of fixing enigmatic proofs and difficulties, and assists them in making the transition from challenge fixing to theorem proving.
without delay a needful textual content and an stress-free learn, Mathematical Problems and Proofs is a wonderful entrée to discrete arithmetic for complicated scholars attracted to arithmetic, engineering, and technology

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Additional info for Mathematical problems and proofs : combinatorics, number theory, and geometry

Example text

9 codes with exactly four 7s, and only one code with all five digits equal to 7. The total is 5 . 94 + 10 . 93 + 10 . 92 + 5 . 9+ 1 = 40951 The more elegant way of solving this problem involves subtracting the number of codes not having any digits equal to 7 from the total number of codes: 105 – 95 = 40951 NOTE: The following equality, obtained by comparison of the two solutions, 105 = 95 + 5 . 94 + 10 . 93 + 10 . 92 + 5 . 9 + 1 is a special case of Newton’s binomial expansion. 12. A can of red paint is spilled over a white plane.

Fibonacci numbers are often encountered in mathematical problems of various kinds and in nature too. , 55, even more but always one of the numbers fn !! Before we go on to generating functions, recall that Newton’s binomial formula can be generalized using the Maclaurin series for (1 +x)α. ) . . (α – k + 1) xk+ . . (1+x)α = 1+ αx + α(α – 1) x 2 +. + 2 k! (| x| < 1, α ∈ R) When α = n, this expression has a finite number of terms, and it reduces to Newton’s binomial formula. 4. Generating Functions Besides the algebraic and combinatorial methods of proofs, there is the third general method used in enumeration and to prove identities and properties of binomial coefficients —the method of generating functions.

1 + x 2+x 4+.. ) ( 1 + x 2 + x 6 + . . ) × × (1 + x 4 + x 8 +. ) . . That is, 1 1 1 1 P(x) = 1 – x 1 – x 2 1 – x 3 1 – x 4 .. By expanding this formula and using number theory, Hardy and Ramanujan derived their approximation. Let us take a look at some other types of partitions.

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