A case of poor integration

19th May 2006 at 01:00
I read, with interest, the article "He can work it out" (TES Friday, May 5) about Lawrence Potter's book Mathematics Minus Fear. However, the three lines of mathematics shown on the blackboard picture contain two minor errors and one significant error (were these deliberate?). These errors are: (i) second line; the term "dx" should not be under the square root sign (minor error) (ii) third line; The term "dx" has been missed out in the integral (minor error) (iii) third line; squaring the expression in the square root of line two, which then appears in line three, has been carried out incorrectly (significant error).

Three errors in three lines is not unusual these days!

Paul Lock

The Cottage

92 Ashby Road

Burton upon Trent, Staffs

Editor's note: the image of the blackboard, reprinted above, came from a picture library, not Lawrence Potter's book. Thanks to both readers for pointing out the errors.

Log-in as an existing print or digital subscriber

Forgotten your subscriber ID?


To access this content and the full TES archive, subscribe now.

View subscriber offers


Get TES online and delivered to your door – for less than the price of a coffee

Save 33% off the cover price with this great subscription offer. Every copy delivered to your door by first-class post, plus full access to TES online and the TES app for just £1.90 per week.
Subscribers also enjoy a range of fantastic offers and benefits worth over £270:

  • Discounts off TES Institute courses
  • Access over 200,000 articles in the TES online archive
  • Free Tastecard membership worth £79.99
  • Discounts with Zipcar, Buyagift.com, Virgin Wines and other partners
Order your low-cost subscription today