adyavanapalli/stanford-introduction-to-mathematical-thinking

Keith Devlin's Introduction to Mathematical Thinking course on Coursera (2017 Spring)

Stanford: Introduction to Mathematical Thinking

Keith Devlin's Introduction to Mathematical Thinking course on Coursera (2017 Spring)

stanford-introduction-to-mathematical-thinking's Issues

Week 2 Assignment 4 Solutions Optional Problems A8

Last sentence should be:

...likewise, if you see a number and it isn't odd, you don't need to verify the rule

Not odd

There is some errors in the AS6 ex3 and ex4

A10.1, problem 2 (b) is incorrect

The correct solution is (-oo,1] U (7,oo).
The posted (incorrect) solution is (-oo,1) U [7,oo).

Incorrect answer on Assignment 10.1 2d

The correct answer is (3, 8] and the posted answer is (-oo,3] U (8,oo), which is incorrect.

As. 2, ex. A2: possible answer

Let SoPaM be the state of a person after the movie.
"I was not displeased with the movie" implies "but I wasn't pleased either, nor is my impression any more extreme." and is therefore ≡
≡ SoPaM₁ ∉ (⋯, −PLEASED] ∪ [PLEASED, ⋯) ≡
≡ −PLEASED < SoPaM₁ < PLEASED
(assuming that PLEASED can be assigned a constant value on a scale, standing at the positive side of a neutral point, and DISPLEASED = −PLEASED)

Query on creating pdf with math equations and symbols

Hi,
I wish to write answers to assignments as pdf with all symbols and equations as you did, can you tell how you wrote the solutions, or which software you used. Thanks.

Invalid implication in question 9(g) of Assignment 7!

$$3|(n^2+5) \to (\exists k \in N) \space n^2+5=3k$$