8 Matching Annotations
  1. Jan 2016
    1. The search box on Project Gutenberg uses a special syntax that actually allows more than just simple text searches. You can search by language, subject, author, and many others. For example:

      • The search "l.german" will produce only texts in German.
      • The search "s.shakespeare" will produce only texts about Shakespeare.
      • The search "s.shakespeare l.german" will produce only texts in German about Shakespeare.

      To see a more complete description of the syntax, go to the search page and click the "Help" button on the top-right of the page.

      I haven't figured out how to search for terms with multiple words in these searches. Can someone figure it out? For example, how do you search for "william shakespeare" as a subject rather than just "shakespeare"? Or "old norse" as a language and not just "norse"?

    1. lath and plaster

      Lath and plaster are both components of buildings.

    2. hypos

      (obsolete) Melancholy; a morbid depression.

      Example: Tell your sister I dont want to hear any more about selling out and moving. That gives me the hypo whenever I think of it.

      Source: Wiktionary

    3. spiles

      Via Wiktionary: A pile; a post or girder.

      A pile in the above sense is "a large stake, or piece of pointed timber, steel etc., driven into the earth or sea-bed for the support of a building, a pier, or other superstructure, or to form a cofferdam, etc" (via Wiktionary).

    4. mole

      Via Wiktionary: A massive structure, usually of stone, used as a pier, breakwater or junction between places separated by water.

      A breakwater stops waves before they reach the port. Notice in the image below that the waves are violent on one side of the mole, but calm on the other.

      A photo of a mole.

    5. Cato

      He seems to be talking about Marcus Porcius Cato Uticensis, a Roman statesman who commited suicide with a sword.

      A statue of Cato.

    1. What this page leaves implicit is that the chain rule is used to calculate the derivative of a composition of two functions. If the composition of f() and g() is f(g()), then the chain rule allows us to find the derivative of f(g()), or (in Leibniz notation):

      df(g(x)) / dx.

      This page is making the point that if we let u = g(x), then the derivative of the composition equals:

      (df(u) / du) * (du / dx).

      In the example at the bottom of the page, the reason we cannot simply use the power rule to find the derivative of (2x + 3)^5 is because the power rule is actually an application of the chain rule which only works when the base of the exponentiation is just x and the power is a constant real number. To see how to derive the power rule from other rules, see the Wikipedia page for Power rule. Then, try deriving (2x + 3)^5 by using the steps therein, and you will see that the answer is not (5)(2x + 3)^4.

    1. DuckDuckGo has some optional special syntax if you need more control over your search. For example, intitle:, filetype:, and some logical expressions can be used. See here for a complete description of the syntax.

      Additionally, the bang feature is useful, and you can browse all of the bangs here.