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 Jun20 answered Triple Scalar Product $=0\implies$Spanning a Plane? (and Checking for Colinearity) Jun18 answered 3D Cartesian Transformation Jun17 comment Convert to displacement time signal (from accelerometer) using velocity time signal or displacement frequency signal What were you expecting and what did you see? Jun17 comment 3D Cartesian Transformation you are correct about any rigid motion being a rotation and translation about an axis. This is called a screw motion. If no one answers I will try to answer this question tomorrow. Jun16 comment 3D Cartesian Transformation Does the transformation involve a translation as well as a rotation? If it does, you will have to use a homogeneous transformation not just a rotation. Jun16 comment This matrix is an attractor? For positive values of $\gamma$, $A$ is not an attractor. By attractor I assume that you mean that the system $\dot{x} = Ax$ system is stable. Jun16 comment Could someone help me to prove that this symmetric matrix is definite positive? How does this question differ from your last question? It appears that they are the same. Jun15 answered How to convert differential equations to Maxwell's equations? Jun14 comment How to convert differential equations to Maxwell's equations? All geometric information is lost in the equation of an RL circuit. There would be no conceivable way to determine field equations involving Div, Grad and Curl from a lumped circuit ODE. Jun13 answered How to think of $\vec{u}-\vec{v}$ Jun10 answered As inspired by a previous question, why is this derivation invalid? Jun9 comment As inspired by a previous question, why is this derivation invalid? Your hunch is correct. What happens if you square both answers? Jun9 comment Prove that $n! < n^n$ where n >1 and is an integer , why do some people say my solution is wrong? because $k! < (k+1)^k \nRightarrow k! < k^k$ Jun9 answered What is the use of the Dot Product of two vectors? Jun7 comment Angle between different rays (3d line segments) and computing their angular relationships Note that if these points are in 3D space, there may not be an easy or obvious way to order them by angle in a way that makes sense. Jun6 comment Euclidean Geometry You can develop a counter example by construction. Consider four co-planar points arranged in a square. The perturb one of them by a displacement of dz in a direction orthogonal to the plane. Clearly , its projection takes it back to the original square which is not in the triangle defined by the other three points. Jun6 comment Euclidean Geometry How do you define projection? Orthogonal or oblique projection? Jun6 answered Why is the line between two points called the line of the “secant”? Jun6 comment Determine if vectors are linearly independent substitute $c=0$ back into (4) or (5) to show that $b=0$ and then both $b=0$ and $c=0$ into (1) or (2) to show that $a=0$. By definition they are then linearly independent. Jun4 answered Calculating rotation matrix of coordinate system from 2 known axis