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2. Seven-dimensional space - Wikipedia

   en.wikipedia.org/wiki/Seven-dimensional_space

   The 6-sphere or hypersphere in seven-dimensional Euclidean space is the six-dimensional surface equidistant from a point, e.g. the origin. It has symbol S6, with formal definition for the 6-sphere with radius r of. The volume of the space bounded by this 6-sphere is. which is 4.72477 × r7, or 0.0369 of the 7-cube that contains the 6-sphere.

3. Seven-dimensional cross product - Wikipedia

   en.wikipedia.org/wiki/Seven-dimensional_cross...

   In mathematics, the seven-dimensional cross product is a bilinear operation on vectors in seven-dimensional Euclidean space. It assigns to any two vectors a, b in ⁠ ⁠ a vector a × b also in ⁠ ⁠. [1] Like the cross product in three dimensions, the seven-dimensional product is anticommutative and a × b is orthogonal both to a and to b.

4. Seventh grade - Wikipedia

   en.wikipedia.org/wiki/Seventh_grade

   Seventh grade. Seventh grade (also 7th Grade or Grade 7) is the seventh year of formal or compulsory education. The seventh grade is typically the first, second or third year of middle school. In the United States, children in seventh grade are usually around 12–13 years old. Different terms and numbers are used in other parts of the world.

5. Geometry - Wikipedia

   en.wikipedia.org/wiki/Geometry

   v. t. e. Geometry (from Ancient Greek γεωμετρία (geōmetría) 'land measurement'; from γῆ (gê) 'earth, land' and μέτρον (métron) 'a measure') [1] is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. [2] Geometry is, along with arithmetic, one of ...

6. Dimension - Wikipedia

   en.wikipedia.org/wiki/Dimension

   In mathematics. In mathematics, the dimension of an object is, roughly speaking, the number of degrees of freedom of a point that moves on this object. In other words, the dimension is the number of independent parameters or coordinates that are needed for defining the position of a point that is constrained to be on the object.

7. List of mathematical shapes - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematical_shapes

   Compound of five great rhombihexahedra. Compound of five icosahedra. Compound of five octahedra. Compound of five octahemioctahedra. Compound of five small cubicuboctahedra. Compound of five small rhombicuboctahedra. Compound of five small rhombihexahedra. Compound of five small stellated dodecahedra.