Errata
Submit your own errata for this product.
The errata list is a list of errors and their corrections that were found after the product was released.
The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.
Color Key: Serious Technical Mistake Minor Technical Mistake Language or formatting error Typo Question
| Version |
Location |
Description |
Submitted By |
| Printed |
Page xix
4th paragraph |
The first sentence, "The information transforms in the brain are made yet more complicated by the constraints...." doesn't make sense.
|
Anonymous |
| Printed |
Page 167
3rd paragraph |
The method for calculating the century-item adjustment for Gregorian dates is
incorrect, since 5 mod 7 = 5, not 0. If we had used the proposed method and
calculated 5 mod 7 correctly, then we would actually get:
20 / 4 = 5
5 mod 7 = 5
3 - 5 = -2
2 * -2 = -4?
Obviously this does not yield the result in Table 4-11, p. 166. If we omit the
modulo operation and replace the division with a modulo 4 operation, then we do get
the results in Table 4-11:
1700s:
17 mod 4 = 1
3 - 1 = 2
2 * 2 = 4
1800s:
18 mod 4 = 2
3 - 2 = 1
2 * 1 = 2
1900s:
19 mod 4 = 3
3 - 3 = 0
2 * 0 = 0
2000s:
20 mod 4 = 0
3 - 0 = 3
2 * 3 = 6
2100s:
21 mod 4 = 1
3 - 1 = 2
2 * 2 = 4
2200s:
22 mod 4 = 2
3 - 2 = 1
2 * 1 = 2
2300s:
23 mod 4 = 3
3 - 3 = 0
2 * 0 = 0
In general, perhaps the author meant, "To get the century-item for any Gregorian
date, cast out fours, subtract the result from 3, and multiply the difference by 2."
Or, in rough mathematical terms:
2 * (3 - (C mod 4))
where C is the century, such that C = 20 for the year 2005.
|
Anonymous |
