mathguy

### Questions (85)

 3 Transitivity of a binary relation 3 Elementary Matrix and Row Operations 3 How to calculate sum of series (Geometric?): $\sum_{n=0}^{\infty}\frac 12 \left(\frac14\right)^{n-1}$ 3 Directional Derivatives (2 var) 3 Vector Tension Using Calculus

### Reputation (857)

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 1 Proof: Show that if A is similar to $B$ and $A$ is nonsingular, then $B$ must also be nonsingular and $A^{-1}$ and $B^{-1}$ are similar 1 Absolute Value Theorem for Sequence 0 Arithmetic modulo of negative number 0 $\frac{1}{\det(A)}A=\operatorname{adj}(A^{-1})$ Proof Check 0 Multivariable 1st Derivative Test (system of equations)

### Tags (64)

 1 linear-algebra × 31 0 partial-derivative × 11 1 sequences-and-series × 12 0 derivatives × 11 1 absolute-value × 2 0 matrices × 9 0 calculus × 21 0 convergence-divergence × 6 0 multivariable-calculus × 19 0 vector-spaces × 6

### Bookmarks (35)

 129 What is the difference between a point and a vector? 77 Why can't you square both sides of an equation? 74 How to calculate $\,(a-b)\bmod n\,$ and ${-}b \bmod n$ [closed] 49 How to tell if a set of vectors spans a space? 39 Why must the base of a logarithm be a positive real number not equal to 1?