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3D Sum of Triangular Numbers (visual proof without words III)

3D Sum of Triangular Numbers (visual proof without words III)

This is a short, animated

Triangular Numbers Modulo 3 (visual proof)

Triangular Numbers Modulo 3 (visual proof)

We present an animation of a

Sum of Odd Cubes is Triangular (visual proof without words)

Sum of Odd Cubes is Triangular (visual proof without words)

This is a short, animated

Sum Cubes with Triangles (visual proof without words V)

Sum Cubes with Triangles (visual proof without words V)

This is a short, animated (wordless)

Alternating Sum of Triangular Numbers (visual proof without words)

Alternating Sum of Triangular Numbers (visual proof without words)

This is a short, animated

Sum of Triangular Numbers I (visual proof)

Sum of Triangular Numbers I (visual proof)

This is a short, animated

Sum of Triangular Numbers II (visual proof via cannonballs)

Sum of Triangular Numbers II (visual proof via cannonballs)

This is a short, animated

Proof Without Words: Sum of Triangular Numbers

Proof Without Words: Sum of Triangular Numbers

This is a short video with a quick

Visual Sum of Squares III (proof without words)

Visual Sum of Squares III (proof without words)

This is a short, animated

Odd Squares as Difference of Triangular Numbers (visual proof)

Odd Squares as Difference of Triangular Numbers (visual proof)

This is a short, animated

Squares from alternating triangles (visual proof without words)

Squares from alternating triangles (visual proof without words)

This is a short, animated

Sums of Oblong Numbers III (visual proof without words)

Sums of Oblong Numbers III (visual proof without words)

This is a short, animated (wordless)

Calculating triangular numbers the fast way: visual proof

Calculating triangular numbers the fast way: visual proof

Have you always wondered why the formula for calculating

Nicomachus's theorem | Visualisation | 3-D animation |

Nicomachus's theorem | Visualisation | 3-D animation |

A

Infinite series: summing reciprocals of triangular numbers (visual proof)

Infinite series: summing reciprocals of triangular numbers (visual proof)

This is a short, animated

3D Visual Sum of Odd Squares | proof without words

3D Visual Sum of Odd Squares | proof without words

This is a short, animated

Proof without Words: Triangular Numbers / Little Gauss

Proof without Words: Triangular Numbers / Little Gauss

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A Multiplicative Triangular Number Recurrence (visual proof)

A Multiplicative Triangular Number Recurrence (visual proof)

This is a short, animated

A Dramatic Finite Sum : Oblong Numbers II (visual proof without words)

A Dramatic Finite Sum : Oblong Numbers II (visual proof without words)

This is a short, animated (wordless)