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 Jun 25 answered What is the column space in a $5\times 5$ invertible matrix? Jun 21 answered How to find Tangential Velocity, Tangential and normal components of acceleration and its range from release Jun 20 comment Triple Scalar Product $=0\implies$Spanning a Plane? (and Checking for Colinearity) @SujaanKunalan, Your first comment: co-linear means that they are on the same line. Your second comment: Yes, if the cross product of any of the two vectors is non-zero, then they at least span a plane. If their triple product is non-zero then they span $\mathbb R^3$. Jun 20 answered Triple Scalar Product $=0\implies$Spanning a Plane? (and Checking for Colinearity) Jun 18 answered 3D Cartesian Transformation Jun 17 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? Jun 17 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. Jun 16 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. Jun 16 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. Jun 16 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. Jun 15 answered How to convert differential equations to Maxwell's equations? Jun 14 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. Jun 13 answered How to think of $\vec{u}-\vec{v}$ Jun 10 answered As inspired by a previous question, why is this derivation invalid? Jun 9 comment As inspired by a previous question, why is this derivation invalid? Your hunch is correct. What happens if you square both answers? Jun 9 comment Prove that $n! < n^n$ where n >1 and is an integer , why do some people say my solution is wrong? because $k! < (k+1)^k \nRightarrow k! < k^k$ Jun 9 answered What is the use of the Dot Product of two vectors? Jun 7 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. Jun 6 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. Jun 6 comment Euclidean Geometry How do you define projection? Orthogonal or oblique projection?