# 0d0a

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bio website location Aylesbury Buckinghamshire, UK age 30 member for 2 years, 5 months seen 2 days ago profile views 60

quadratic linear form XFX with matrix

F:  1   1
1   1


in canonical base can be expressed as X' F' X'

X'  1   0   X'
0   0


where X'=A-1X, F'=AFA and A is transition matrix. Canonical base vectors are [1,0] and [-1,1]. Thus this is correct that (a+b)^2 = a^2 + b^2 + 2ab

 3 Sum of $\sum_{n=0}^\infty \frac{(x+2)^{n+2}}{3^n}$ 3 is this solution of $AX=0$ in space VA? 2 Finding two unknown vectors 1 Why is one of the conditions of a vector space that if I add two vectors, the sum must be within the space? 1 Simple explanation for number of solutions of system of linear equations

# 371 Reputation

 +10 Why is one of the conditions of a vector space that if I add two vectors, the sum must be within the space? +10 Simple explanation for number of solutions of system of linear equations +20 Finding two unknown vectors +5 check if point is on a plane (using Heron formula ?)

# 7 Questions

 3 Why does each subfield have to contain multiples of 1? 2 straightforward way to determine if this set is convex? 2 check if point is on a plane (using Heron formula ?) 2 is this solution of $AX=0$ in space VA? 1 how to interpret theorem about polynomial factorization over modulo ring?

# 30 Tags

 8 linear-algebra × 12 3 summation 4 vector-spaces × 6 2 real-analysis × 3 3 limits × 2 2 vectors 3 matrices × 2 1 modular-arithmetic × 2 3 sequences-and-series 1 multivariable-calculus × 2

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