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2. File:Graph paper mm A4.pdf - Wikipedia

   en.wikipedia.org/wiki/File:Graph_paper_mm_A4.pdf

   Download QR code; In other projects ... green, light green, black graph papers with 1 cm–0.5 cm–1 mm grids (page size: A4) in printable PDF format. Date: 25 July ...

3. File:Graph paper mm green A4.svg - Wikipedia

   en.wikipedia.org/wiki/File:Graph_paper_mm_green...

   ; Created in LibreOffice 4 with this LibreLogo program. ; Usage: Put this code into an English language document in LibO Writer, ; and click on the Start icon of the View»Toolbars»Logo toolbar.

4. Graph paper - Wikipedia

   en.wikipedia.org/wiki/Graph_paper

   Hexagonal paper shows regular hexagons instead of squares. These can be used to map geometric tiled or tesselated designs among other uses. Isometric graph paper or 3D graph paper is a triangular graph paper which uses a series of three guidelines forming a 60° grid of small triangles. The triangles are arranged in groups of six to make hexagons.

5. List of open-source software for mathematics - Wikipedia

   en.wikipedia.org/wiki/List_of_open-source...

   SageMath is designed partially as a free alternative to the general-purpose mathematics products Maple and MATLAB. It can be downloaded or used through a web site. SageMath comprises a variety of other free packages, with a common interface and language. SageMath is developed in Python.

6. Presentation of a group - Wikipedia

   en.wikipedia.org/wiki/Presentation_of_a_group

   To see this, given a group G, consider the free group F G on G. By the universal property of free groups, there exists a unique group homomorphism φ : F G → G whose restriction to G is the identity map. Let K be the kernel of this homomorphism. Then K is normal in F G, therefore is equal to its normal closure, so G | K = F G /K.

7. Contact graph - Wikipedia

   en.wikipedia.org/wiki/Contact_graph

   In the mathematical area of graph theory, a contact graph or tangency graph is a graph whose vertices are represented by geometric objects (e.g. curves, line segments, or polygons), and whose edges correspond to two objects touching (but not crossing) according to some specified notion. [1]