Category Archives: Maths

Hermione’s Stone (2)

Minus Signs Hermione’s Stone (according to my alternative plot) was now, it seemed, firmly stuck in some sort of time loop, being picked up, thrown, picked up and thrown ad infinitum. What struck me by the diagram I had constructed, … Continue reading

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Hermione’s Stone (1)

Harry Potter and the Prisoner of Azkaban A couple of weeks ago now my family and I were watching said film. We’ve seen it many times so each viewing is an opportunity to spot something new. It was the scene … Continue reading

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MathsJam Show-and-Tell: The Bridges of Cardiff County

The Seven Bridges of Cardiff ? This is a straight copy of the initial questions I posed at Cardiff #MathJam on Tuesday 20th October 2015, at the ‘Grape and Olive’ pub. Königsberg: Seven Bridges for Seven Brothers In 1736 Leonhard … Continue reading

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Erdös Number ?

Do I have an Erdös Number, despite only having published three papers ? The Erdös Number was the original form of tracing people-related connections through some defined network, of which the [Kevin] Bacon Number is most famous. Here are the three papers and … Continue reading

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My Brush with GCHQ

Alright, I didn’t know the code was from GCHQ and I only saw it on the last night of the “game” (30.11.11), so I suspect I would have needed a lot longer than a couple of hours to crack (try infinitly long). I did however make … Continue reading

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New Science Programmes with Jim Al-Khalili

Watch out for two new programmes with Jim Al-Khalili in the next few days: 1) Shock & Awe : The Story of Electricity, BBC4 at 9pm, Thursday 6th October. Link to a clippet : http://www.bbc.co.uk/programmes/p00ksnyn 2) The Scientific Life, BBC Radio … Continue reading

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Useful symbols

Useful maths and logic symbols: ℂ ℝ ℚ ∞ φ | ψ ∑ ∫ ∮ ∇ ∂ Δ δ σ † ⊥ ∀ ⊧ → ⊢ ¬ ⊗ × π ∧ ⇔ ∃ ℵ ℝ ~ ∈ ℤ ± ∓ … Continue reading

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