I’m writing to follow up on a discussion we had in class today, regarding methods for translating conditional (“if…then”) statements from English to symbols.
We started with:
If it rained, the ground got wet.
Which we symbolized as
R -> W
Where R = “it rained” and W = “the ground got wet”.
We then got stuck on the phrase:
It rained only if the ground got wet.
The correct symbolic version of this is:
R -> W
just as it appeared in the slides, where R = “it rained” and W = “the ground got wet”, just as before. This is counterintuitive, but true!
For a longer discussion, with some better examples, take a look at this page (otherwise, just memorize it!):
Due Thursday, 9/20/18. For this week’s writing assignment, take a look at the picture below called “Sentences.” Read every sentence in the picture. As you read, pay attention to your own stream of consciousness – what are the thoughts that pop into your head? For full credit, respond to all 4 of the following items.
- Record two observations about the sentences in the picture – what do you notice / what’s something you find interesting / what popped into your head / what stood out.
- Choose one of the sentences in the picture (do NOT choose the same sentence as anyone else). Type the sentence out “in quotes”, and then answer the following questions:
a. Is it a statement (as discussed in class on Tuesday)? Explain why or why not.
b. Is it true or false? Explain in everyday English why or why not.
- Make up a sentence that you believe would fit into this picture. Tell us the sentence, and then tell us whether it is a statement, and whether it is true or false.
- What connection (if any) does this assignment have to do with the work we are doing in class?
“Sentences” by Flickr user Eldeem