What’s New at BrownMath.com
Copyright © 2015–2020 by Stan Brown
This page tracks significant updates to the site.
Smaller changes are tracked in the “What’s New”
sections of the individual pages.
With the help of the kind folks at
newsgroup comp.infosystems.www.authoring.html, particularly Jukka
Korpela, I am updating every page on the site to meet modern
- Server headers now identify the character set as
Windows-1252, which should fix garbage characters for the readers who
got them. (Previously, the server didn’t send any information about
the character set, which was a problem because of the next bullet
point.) I used the W3C’s
i18n [internationalization] checker
to verify that the server was now sending correct and complete
- Pages now
identify themselves as using the character set Windows-1252,
not utf-8 as formerly. The pages were always in the Windows-1252
character set (well, really ISO-8859-1, but in the Web world the two
are synonyms), and the identification as utf-8 was a pure blunder on
my part. Truly, nothing good comes of lying to the browser.
- Pages now validate against HTML5, and contain an appropriate
DOCTYPE declaration. Previously, they were validated
against HTML 4.01. Since the W3C’s
command-line HTML5 validator
is stricter than the NSGMLS validator I was using to check against
HTML 4.01, findng and fixing these additional errors may help some
browsers to do a better job of displaying pages.
- Character references –ÿ (accented
letters, curly quotation marks, em and en dashes, and some other
symbols) are being replaced with the actual characters, which
should look no different on your screen but make files somewhat
- Many pages used just the first character of a radical sign, like
this: √(62+45). They now use a
standard radical sign with overbar, √62+45, which
eliminates a layer of parentheses and should be easier to read.
- Variable names are being italicized, in accordance with
the ISO 80000-2 standard for printing.
I started these changes in mid-October and finished
them in mid-November — except for italicizing
variable names, which is still in progress. You may not notice
any of these changes, but if you do see anything wrong, please
tell me about it.
- Several page titles changed, from the form “Graphing…” to the form
“How to Graph…”, which sounds more inviting.
- Following a suggestion by Ernest Brock, modified two tests for
equality in the MATH200A
and MATH200B programs, to
compensate for the calculator’s handling of floating point.
- Gave the Site Map a bit of a
facelift, for a cleaner appearance.
- Google searches and other links to Google are now https instead of
- Links displayed when you print BrownMath.com pages are now
https instead of http. (The pages themselves have been https since
- BrownMath.com is now served up as secure HTML (https
protocol). All old bookmarks are redirected automatically.
- The textbook Trig without Tears got
a long-overdue makeover. I added more examples, more
pictures, and a set of practice problems (with full solutions) for
every chapter. There’s a new chapter on how trig sheds light on
complex numbers, and new or rewritten sections in several other
chapters. The asides that were in a separate Notes chapter have
moved, as BTWs, to the chapters where they are most relevant.
- On the algebra front, there’s a new article,
Denesting Radicals (or Unnesting Radicals).
- Change “What’s Different between TI-83 and TI-84?”
to Differences among TI-83s and TI-84s. Update the article for the color
models of TI-84, and firmware upgrades to the black&white
- All the Excel workbooks in the
business sections of the site are now in
Excel 2007–2016 format.
- Trig without Tears had a vintage 2002 program for
solving triangles on the TI-83. I thoroughly overhauled it and made it
compatible with all TI-83 Plus and TI-84 Plus models, including the
new color models, then moved it to a
new article with worked examples
and screen shots.
- I was using obsolete code for the Donate button, and it took you
to a PayPal page that didn’t even mention BrownMath.com.
(Still, thanks to the people who persevered and made donations!)
I’ve fixed that.
- The site map now includes icons
for TI-83/84 procedures.
- Several articles weren’t referenced from the
site map or the section index
pages; now they all are.
- “Binomial Probability Distribution on TI-83/84” is
withdrawn, because the
textbook does a better job.
The MATH200B program
didn’t display well with the new color TI-84 models, TI-84 Plus
C Silver Edition and TI-84 Plus CE. I first created separate programs
for the new calculators, but that was a dead-end approach.
Both MATH200B and
MATH200A now sense whether
they’re running on a high-resolution TI-84, and adjust their
display format accordingly. Sometimes that even lets one screen hold
the information of two screens on the older calculators.
New Web site!