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Dear Dirichlet, Issue 01

Moonlighting agony uncle Professor Dirichlet answers your personal problems. Want the Prof’s help? Send your problems to deardirichlet@chalkdustmagazine.com.

Dear Dirichlet,

This week’s problem sheet asks me to show that $\log(x) < x-1$ for all $x > 0$. To me this seems obviously true – a quick sketch backs it up as well. I think I’m supposed to use Taylor series or something but I’m not sure where to start. Can you help?

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What’s hot and what’s not, Issue 01

"A blackboard, for a mathematician, is an unrivalled way to communicate" - Cédric Villani, Fields Medallist 2010

“A blackboard, for a mathematician, is an unrivalled way to communicate” – Cédric Villani, Fields Medallist 2010

Blackboards

The mathematical equivalent of a Little Black Dress. Blackboards will never go out of style.

E-learning systems

In the immortal words of the Black Eyed Peas, interactive whiteboards are so two thousand and late.

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£100 Prize Crossnumber, Issue 01

Our original £100 prize crossnumber is featured on pages 34 and 35 of Issue 01.

Rules

  • Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0.
  • One randomly selected correct answer will win £100. Three randomly selected runners up will win a Chalkdust pen. The prizes have been provided by G-Research, researchers
    of financial markets and investment ideas. Find out more at gresearch.co.uk.
  • To enter, email crossnumber@chalkdustmagazine.com with the sum of the across clues by 22 July 2015. Only one entry per person will be accepted. Winners will be notified by email by 1 August 2015.
  • Entry is now closed.

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