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Because if you have one apple and then take another and put it with that one apple you would then have two apples. Therefore 1 + 1 = 2 ANSWER 2- Well you could test it by going 2 - 1 = 1, but somethings in math you just have to go along with, it just works ANSWER NUMBER 3: Russell's & Whitehead's proof uses pure symbolic logic. It's pretty arcane, though, because first you have to come to a definition of what "1" means, what "2" means, and even what "+" & "=" means! It's a lot harder than you think without using circular definitions (eg "1" is when there is only one of something - this won't do as a definition).
The proof goes something like this (remember, it depends on set theory):
We start off by defining the natural numbers (ie positive integers) in terms of sets.
For any set S, define a "successor" function f as
f(S) = {S, {S}}
ie, the set containing: S and the set containing S.
Then we define the natural integers as such:
Define the number 0 to be the empty set, which I'll write here as O.
Then each successive integer (ie "n+1") is just the preceding integer put through the successor function, ie
1 = {O, {O}}
2 = {O, {O, {O
3 = {O, {O, {O, {O}
and so on.
Then 1+1=f(1)={O, {O, {O=2. QED.
By the way, from this definition of natural integers we can work out the entire system of arithmetic, including rational numbers, irrational & transcendental numbers, multiplication, division etc...
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One plus one equals to?
2 or two is the answer.
What does two-fourths plus two-eigths equal?
two fourths equals one half two eighths equals one quarter one half plus one quarter is three quarters. Or, two fourths equals four eighths four eighths plus two eighths equals six eighths six eighths equals three quarters.
One plus two?
Its equals 3
How does 1 plus 1 equal 10?
No it does not, one plus one equals two.
How much is One forth plus one eight equals?
one forth is equal to two eighths. therefore two eighths plus one eighth equals three eighths
Does two plus two equals a window?
no. one plus one equals window
What does one plus two equal?
One plus two equals three (3).
What does one plus one equall?
one plus one equals two
One plus one equals to?
2 or two is the answer.
How many is two?
One plus one equals two.
If you start without a definition of one or two how do you prove that one plus one equals two?
a) Everyone knows what one and two are, so they will know 1 + 1 = 2 b) Assuming they do not know what one and two are, it will be impossible to explain to them 1 + 1 = 2, because these definitions are ESSENTIAL to prove 1 + 1 = 2.
What does two-fourths plus two-eigths equal?
two fourths equals one half two eighths equals one quarter one half plus one quarter is three quarters. Or, two fourths equals four eighths four eighths plus two eighths equals six eighths six eighths equals three quarters.
What is two plus one plus one minus four?
It equals 0
One plus two?
Its equals 3
What plus one-third equals one?
One third plus one third equals two thirds. Similarly, one cow plus one cow equals two cows, and one book plus one book equals two books. Have you learned anything today ?
What is 2 plas 2?
one plus one is dog two plus two equals fish and three pluss three equals cat four plus four equals rabbit 10 plus 10 equals cow and 32 plus 32 equals wilderbeast and so on and so fourth.
X plus one over x squared plus two?
it equals x1 it equals x1
