kEND

SICP 1.1
10
=> 10
(+ 5 3 4)
=> 12
(- 9 1)
=> 8
(/ 6 2)
=> 3
(+ (* 2 4) (- 4 6))

kEND

SICP 1.2
(/ (+ 5 4 
        (- 2 
           (- 3 
              (+ 6 
                 (/ 5 4)
              )
           )
         )
   ) 

kEND

(define (square x) (* x x))

(define (sum-of-squares x y) (+ (square x) (square y)))

(define (larger x y) (if (> x y) x y))

(define (sum-squares-of-largest-two x y z) 
  (cond ((and (> x y) (> x z)) (sum-of-squares x (larger y z)))
        ((and (> y x) (> y z)) (sum-of-squares y (larger x z)))
        (else (sum-of-squares z (larger x y)))

kEND

(define (a-plus-abs-b a b) 
  ((if (> b 0) + -) a b)

b is evaluated to be greater than zero or not
based on that evaluation the + or - operator is selected
and used to add a and b if b is positive or subtract b from a if b is negative

kEND

(define (p) (p)) 
(define (test x y) 
  (if (= x 0) 
      0 
      y)) 

applicative-order evaluation
   evaluate arguments and then apply   

normal-order evaluation

kEND

;; new-if....

With the new-if, things look good when the case is simple and it doesn't matter if the then-clause and else-clause get evaluated.  Using the special form if, first the predicate will be evaluated and then the then-clause OR the else-clause.  With the new-if procedure, all arguments will be evaluated first.  This sqrt-iter will not progress to any result.  Infinite loop.

kEND

;; good-enough?

The good-enough? test used in computing square roots will not be very effective for 
finding the square roots of very small numbers. Also, in real computers, arithmetic operations are 
almost always performed with limited precision. This makes our test inadequate for very large 
numbers. Explain these statements, with examples showing how the test fails for small and large 
numbers. An alternative strategy for implementing good-enough? is to watch how guess changes 
from one iteration to the next and to stop when the change is a very small fraction of the guess. Design 
a square-root procedure that uses this kind of end test. Does this work better for small and large 
numbers?

kEND

Chapter 1: Grace and Truth

Grace and Truth Divided

• Our God is a God "full of grace and truth" Jn 1:14.

• What are grace and truth? What happens when they are divided?

• Grace is the unmerited favor of God towards people. It is unconditional love and acceptance. Relationship with God. Relational aspect to God's character.

kEND

Keybase proof

I hereby claim:

• I am kEND on github.
• I am kEND (https://keybase.io/kEND) on keybase.
• I have a public key whose fingerprint is 9156 BD9B 2404 9264 A1C3 6612 F808 8AEF 960C 46A5

To claim this, I am signing this object:

kEND

Verifying myself: My Bitcoin username is +kend. https://onename.io/kend