1 Functioning Mathematically John Mason St Patrick’s College Dublin Feb 2010.

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Presentation transcript:

1 Functioning Mathematically John Mason St Patrick’s College Dublin Feb 2010

2 Conjecturing Atmosphere  Everything said is said in order to consider modifications that may be needed  Those who ‘know’ support those who are unsure by holding back or by asking revealing questions

3 Inter-Rootal Distances  Sketch a quadratic for which the inter- rootal distance is 2.  and another  How much freedom do you have?  What are the dimensions of possible variation and the ranges of permissible change?  What sets of numbers can be the set of inter-rootal distances for a polynomial?

4 Zig Zags

5

6 Notation y = |x 2 – a|y = |x – a|  What might the graph of y = ||x-1|-2| look like?

7 ZigZags Can you make these? What can and cannot be made? Characterising

8 Zig Zags  What might the graph of y = ||x-2| – |x-5|| look like?

9 Towards the Blanc Mange function

10 Reading Graphs

11 Powers / Specialising & Generalising / Conjecturing & Convincing / Imagining & Expressing / Characterising / Distinguishing & Connecting / Assenting & Asserting

12 Didactic Transposition Expert awareness is transposed/transformed into instruction in behaviour (Yves Chevellard)

13 More Ideas (2002) Mathematics Teaching Practice: a guide for university and college lecturers, Horwood Publishing, Chichester. (2008). Counter Examples in Calculus. College Press, London. (1998) Learning & Doing Mathematics (Second revised edition), QED Books, York. (1982/2010). Thinking Mathematically, Pearson, London For Lecturers For Students