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ankush981
  • Member for 11 years, 8 months
  • Last seen more than 1 year ago
  • India
44 votes
9 answers
126k views

Prove that $\sqrt 2 + \sqrt 3$ is irrational [duplicate]

22 votes
5 answers
63k views

Prove that $\sqrt 5$ is irrational

15 votes
4 answers
16k views

Prove by contradiction that every integer greater than $11$ is a sum of two composite numbers

11 votes
5 answers
1k views

Am I fit for higher studies/teaching in mathematics? [closed]

6 votes
3 answers
2k views

A combinatorial proof that the alternating sum of binomial coefficients is zero

6 votes
3 answers
6k views

Contrapositive: $\forall\; n > 1, n:$ composite $\implies\exists\; p$ (prime) s.t. $p \leq \sqrt n$ and $p\mid n$

5 votes
3 answers
994 views

Prove $\forall n > 2, \ \exists p\in \Bbb{P} : n < p < n!$

4 votes
1 answer
120 views

Is this proof of mine regarding prime numbers correct?

4 votes
3 answers
4k views

At least one member of a pythagorean triple is even

4 votes
2 answers
2k views

Textbook proof for uniqueness of inverse in a group

4 votes
1 answer
81 views

Confused about this set representation and conclusions

4 votes
2 answers
932 views

Expected happiness with meal quality

4 votes
4 answers
118 views

Rolling three dice - why is my reasoning wrong?

3 votes
2 answers
865 views

Finesse vs. brute force in solving quadratic equations

3 votes
1 answer
250 views

Indeterminate equations: Special cases

2 votes
2 answers
3k views

Help understand this proof of even and odd subsets

2 votes
1 answer
134 views

Help understand "unless"

2 votes
2 answers
116 views

Need help with this absolute value equation

2 votes
1 answer
240 views

Help solve this through complex numbers

2 votes
2 answers
137 views

Factor this quadratic expression

2 votes
1 answer
3k views

Proof of unique factorization theorem (existence) using well-ordering principle [duplicate]

2 votes
1 answer
177 views

Confused about sum of G.P. formula

2 votes
2 answers
44 views

Prove this result related to progressions

2 votes
1 answer
56 views

Help with this solution of quadratic equation

2 votes
3 answers
256 views

Textbook confusion in 8-bit representation

2 votes
3 answers
5k views

Prove that every integer is either prime or composite

2 votes
1 answer
140 views

Prove this result about construction of sets

1 vote
1 answer
382 views

Number of even and odd subsets -- wrong question?

1 vote
2 answers
12k views

Getting even number of heads in a coin toss - unbiased coin [duplicate]

1 vote
1 answer
472 views

Finding the missing number from a sequence