Sum & Product of Two Algebraic Numbers
24551
How to prove that the sum and product of two algebraic numbers is algebraic?
126561
Proof of equivalence of algebraic and geometric dot product?
108688
An identity involving products of sums
69045
Solving this summation: $\sum_{i=1}^k i\cdot2^i$
125876
Sum and Product of Infinite Radicals
110975
Summation of reciprocals
21780
Period of the sum/product of two functions
41789
Fermat's theorem on sums of two squares
68007
Sum or Product with Exclusions
50615
Expressing a Non Negative Integer as Sums of Two Squares
142978
combinatorics: sum of product of integer compositions
48977
Polynomials having as roots the sum (respectively, the product) of two algebraic elements
137967
Are there $a,b \in \mathbb{N}$ that ${(\sum_{k=1}^n k)}^a = \sum_{k=1}^n k^b $ beside $2,3$
8207
Can I prove this inequality algebraically?
63155
Express $1+2\cos a$ as a product
35765
product of two numbers ending in 6 also ends with 6
50445
Explaining the product of two ideals