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Projective geometric algebra as a subalgebra of conformal geometric algebra. (English) Zbl 1462.15028

The text offers a view of projective geometric algebra as a subalgebra or conformal geometric algebra. The emphasis is mainly given to the three-dimensional Euclidean space that is the most interesting for applications. Although it is a classical topic, there is some novelty in this approach which makes the presentation interesting and clear, suitable even for non-experts in Clifford algebras and geometry. The authors propose a brief and pedagogical overview with explicit constructions and a systematic derivation of the new results, following the close connection to geometry with various examples and even a piece of source code at the end. This well written paper may interest a broad spectrum of readers: from specialists in the field to curious students.

MSC:

15A67 Applications of Clifford algebras to physics, etc.
15A66 Clifford algebras, spinors
51N25 Analytic geometry with other transformation groups

Software:

ganja.js

References:

[1] Dorst, L.; Fontijne, D.; Mann, S., Geometric algebra for computer science: an object-oriented approach to geometry (2007), Burlington: Morgan Kaufmann Publishers Inc., Burlington
[2] Du, J.; Goldman, R.; Mann, S., Modeling 3D Geometry in the Clifford Algebra R(4, 4), Adv. Appl. Clifford Algebras, 27, 3039-3062 (2017) · Zbl 1386.15045 · doi:10.1007/s00006-017-0798-7
[3] Gunn C.: On the Homogeneous model of euclidean geometry. In: Dorst L., Lasenby J. (eds) Guide to geometric algebra in practice. Springer, London (2011). doi:10.1007/978-0-85729-811-9_15 · Zbl 1291.15066
[4] Gunn, CG, Doing euclidean plane geometry using projective geometric algebra, Adv. Appl. Clifford Algebras, 27, 1203 (2017) · Zbl 1368.51018 · doi:10.1007/s00006-016-0731-5
[5] Gunn, CG, Geometric algebras for Euclidean geometry, Adv. Appl. Clifford Algebras, 27, 185 (2017) · Zbl 1367.15035 · doi:10.1007/s00006-016-0647-0
[6] Gunn, C.G., De Keninck, S.: 3D PGA Cheat Sheet, An extensive reference with 3D PGA formulas, online: bivector.net
[7] De Keninck, S.: ganja.js, https://zenodo.org/record/3635774 (2020)
[8] Hildenbrand, D.: Foundations of geometric algebra computing. Springer Science & Business Media (2013) · Zbl 1268.65038
[9] Hildenbrand, D., Introduction to geometric algebra computing (2018), Boca Raton: Chapman and Hall/CRC, Boca Raton · Zbl 1397.00009
[10] Hrdina, J.; Návrat, A.; Vašík, P., Control of 3-link robotic snake based on conformal geometric algebra, Adv. Appl. Clifford Algebr., 26, 3, 1069-1080 (2016) · Zbl 1394.93209 · doi:10.1007/s00006-015-0621-2
[11] Hrdina, J.; Návrat, A.; Vašík, P.; Matoušek, R., CGA-based robotic snake control, Adv. Appl. Clifford Algebr., 27, 1, 621-632 (2017) · Zbl 1364.93150 · doi:10.1007/s00006-016-0695-5
[12] Lasenby, A.; Dorst, L.; Lasenby, J., Rigid body dynamics in a constant curvature space and the ‘1d-up’ approach to conformal geometric algebra, Guide to geometric algebra in practice (2011), London: Springer, London · Zbl 1234.68004
[13] Lounesto, P.: Clifford algebra and spinors, 2nd edn. CUP, Cambridge (2006) · Zbl 0596.15028
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