Ohtani’s Batting Average Sep 2024 khoitsma Kids (middle school and up), Mathematics, Mental Math 0 Comments

What is the perimeter? Jul 2024 khoitsma General, Kids (middle school and up), Mathematics 0 Comments Continue Reading

100 Prisoner Problems Mar 2024 khoitsma General, Kids (middle school and up), Mathematics, Probability/Statistics 0 Comments Continue Reading

GeoGebra app Feb 2024 khoitsma General, Kids (middle school and up), Mathematics 0 Comments Screenshot Continue Reading

Reflection on Billiards and Math Feb 2024 khoitsma General, Kids (middle school and up), Mathematics 0 Comments This inscribed triangle is a periodic billiard trajectory called the Fagnano orbit, named for Giovanni Fagnano, who in 1775 showed that this triangle has the smallest perimeter of all inscribed triangles. Continue Reading

What is the Day of the Week? Jan 2024 khoitsma General, Kids (middle school and up), Mathematics, Mental Math 0 Comments Continue Reading

Hand Calculated Truss vs RISA Dec 2023 khoitsma Calculus, Computer Algebra, Engineering, Jupyter, Mathematics, Plotly, Python, RISA-3D, Sympy hand calculated, RISA, truss 0 Comments Continue Reading

Kolam Muggu Rangoli Dec 2023 khoitsma Calculus, General, Mathematics, Science 0 Comments Continue Reading

Wolfram — Writings Dec 2023 khoitsma Calculus, General, Mathematics, Science 0 Comments ‘The Concept of the Ruliad’‘Expression Evaluation and Fundamental Physics’ Continue Reading

Feynman — The Relation of Physics to Other Sciences Dec 2023 khoitsma Calculus, General, Mathematics, Science 0 Comments ‘The Relation of Physics to Other Sciences’‘The Value of Science’‘Bonus’ Continue Reading

Engineering Math Nov 2023 khoitsma Engineering, Kids (middle school and up), Mathematics, Mental Math 0 Comments “Often while working, an arithmetical answer is needed — exact is sometimes required, approximate is often acceptable — maybe the basis of a decision or a path forward is based on a few quick calculations, with more rigorous calculations to follow Multiply by 11 (or 12). Just write down the answer ! Pascal’s Triangle Aliquot Parts Continue Reading

Convolution as seen in Virtual Work Nov 2023 khoitsma Calculus, Engineering, Jupyter, Mathematics, Plotly, Python, Sympy 0 Comments Is this convolution linear or nonlinear? Continue Reading

Photomath and Slide Rule Competition Oct 2023 khoitsma General, Mathematics, Software 0 Comments Can you work this problem by hand? Continue Reading

Moment due to Linearly Varying Pressure Aug 2023 khoitsma Calculus, Engineering, Excel, Mathematics, Python, PyXLL, Sympy 0 Comments I built a new function in Python and PyXLL Continue Reading

Small Ideas — Large Effects Aug 2023 khoitsma Concept, Engineering, General, History, Mathematics, Science, Software 0 Comments Continue Reading

Foundation Bearing Pressures using Jupyter and PyXLL (with videos) Mar 2023 khoitsma Calculus, Engineering, Excel, Jupyter, Plotly, Python, PyXLL, Video 0 Comments Continue Reading

Digit Sums and Cyclic Patterns Jan 2023 khoitsma Concept, Mathematics 0 Comments Excerpt from the paper ‘This simple pattern may be recalled when students are first exposed to cosets and quotient groups much later in their academic career, as the set {2, 8} is one of six cosets in the quotient group C_{12}/{0, 6}.’ Continue Reading

Monty Hall — Consider Only Strategy Dec 2022 khoitsma Concept, Probability/Statistics 1 Comment And what’s the chance it’s a yellow car? Continue Reading

Rechnen, Multiplizieren und Addieren Nov 2022 khoitsma Kids (middle school and up), Mathematics, Mental Math 0 Comments Sum the numbers — let me count the ways Continue Reading

Easy Section Properties for Array of Points © Oct 2022 khoitsma AISC, Concept, Engineering, Mathematics, Steel Detail 0 Comments Based on finite calculus Continue Reading

OEIS Triangle to Square Sep 2022 khoitsma Kids (middle school and up), Mathematics 0 Comments Continue Reading

The elastica: a mathematical history — Raph Levien Aug 2022 khoitsma Calculus, Engineering, Mathematics 0 Comments Continue Reading

Learn Julia / Learn Calculus Aug 2022 khoitsma Calculus, Julia, Mathematics 0 Comments Calculus with Julia by John Verzani Continue Reading

Asymmetric Frame Loading Jul 2022 khoitsma Calculus, Engineering, Jupyter, Mathematics, Plotly, Python, RISA-3D, SAP2000, Sympy 0 Comments In memory of Dr. Terry Kohutek, Texas A & M, Professor of Civil Engineering Continue Reading

The Analog Clock Jul 2022 khoitsma General, Kids (middle school and up), Mathematics 0 Comments 25 or 6 to 4 – Robert Lamm, Chicago Haven’t we all looked at the clock face and wondered about the magical times where the hands cross? Continue Reading

Structural Calculations for Beams Using Calculus via Sympy Jul 2022 khoitsma Calculus, Computer Algebra, Engineering, Jupyter, Mathematics, Plotly, Python, Sympy 0 Comments Something about calculus and Sympy is lovable. Click to see R1 plot; hover over data points to see data values; use finger or mouse to select rectangular area of interest Continue Reading