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Isomorphism and group properties: Do group properties transfer to isomorphic structures? Yes - | and Christian Spannagel proves it in this video.
spektrum.de/video/christian-spannagel-isomorphie-und-gruppeneigenschaften/2279701

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9 times true or false: From prime numbers to square numbers to equilateral triangles: In this video, Christian Spannagel presents a typical exam question.
spektrum.de/video/christian-spannagel-9-mal-wahr-oder-falsch/2315117

The number sequence 5, -15, 45, -135, 405: How do you express a number sequence in recursive or closed form?
spektrum.de/video/christian-spannagel-die-zahlenfolge-5-15-45-135-405/2314130

The Euler line in GeoGebra: Today's topic in the »Christian Spannagel« video: We construct the Euler line in GeoGebra.
spektrum.de/video/christian-spannagel-die-euler-gerade-in-geogebra/2308322

What are exponential functions: Today's topic: Exponential functions
spektrum.de/video/christian-spannagel-was-sind-exponentialfunktionen/2307635

Higher eyes count: Today's topic: Chance and probabilities
spektrum.de/video/christian-spannagel-die-hoeheren-augen-zaehlen/2306564

Pentagram and hexagram: Angle sums at the vertices: Today's topic in the »Christian Spannagel« video: We calculate the angle sums of the vertices of a ...
spektrum.de/video/christian-spannagel-pentagramm-und-hexagramm-winkelsummen/2302219

Mulled wine functions: Today's topic: Functional relationships
spektrum.de/video/christian-spannagel-gluehwein-funktionen/2301892

The complementary set: Christian Spannagel explains the complementary set.
spektrum.de/video/christian-spannagel-die-komplementaermenge/2298145

Division in the 6-base system: 22304/5: How does division in the 6-base system work? Christian Spannagel explains it using example 22304/5.
spektrum.de/video/christian-spannagel-division-im-6er-system-22304-5/2296970

We define the term rhombus: In this video, Christian Spannagel examines what constitutes a rhombus from a mathematical perspective.
spektrum.de/video/christian-spannagel-wir-definieren-den-begriff-raute/2294252

Solutions to Smart Squares: In this video, Christian Spannagel shows how to find patterns and structures with squares.
spektrum.de/video/christian-spannagel-loesungsansaetze-zu-smarten-quadraten/2292979

The intersection point of the side bisectors in a triangle: Do all the side bisectors of a triangle intersect? Yes - | and at one point! Christian Spannagel ...
spektrum.de/video/christian-spannagel-schnittpunkt-der-seitenhalbierenden-im-dreieck/2279497

The median parallel in a triangle: We prove the median parallel theorem in a triangle
spektrum.de/video/christian-spannagel-die-mittelparallele-im-dreieck/2279262

Commutativity in cyclic groups: Christian Spannagel shows how to prove that cyclic groups are commutative in this video.
spektrum.de/video/christian-spannagel-kommutativitaet-in-zyklischen-gruppen/2278654

Proof of the Pythagorean Theorem: We prove the Pythagorean Theorem
spektrum.de/video/christian-spannagel-beweis-des-kathetensatzes/2277519

Proof of Euclid's altitude theorem: In this video, Christian Spannagel proves Euclid's altitude theorem.
spektrum.de/video/christian-spannagel-beweis-des-hoehensatzes-von-euklid/2277137

Isomorphic groups and inverse elements: Today's topic: We look at what happens to the inverse elements when we map them with an isomorphism.
spektrum.de/video/christian-spannagel-isomorphe-gruppen-und-inverse-elemente/2276949

Another proof of isomorphism: Today's topic: We prove that the set of real numbers with addition is isomorphic to the set of positive real numbers with ...
spektrum.de/video/christian-spannagel-noch-ein-beweis-zu-isomorphie/2274038

Proof of isomorphism: We prove that the set of integers with addition is isomorphic to the set of even integers with addition.
spektrum.de/video/christian-spannagel-beweis-zu-isomorphie/2273814

Proof of the sock-shoe rule: Christian Spannagel proves the sock-shoe rule in this video!
spektrum.de/video/christian-spannagel-beweis-der-socke-schuh-regel/2268310

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