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Math Proof Training and Practice Forum
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Participate in free math proof training events and practice your proofs with expert math guides helping you step by step.
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Constructive Proofs
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Sticky
Math Proof Training Camp and Practice Guidelines
Aug 17, 2020
Replies
0
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Sticky
Challenge
Solution Manuals For The Math Challenges
Sep 8, 2019
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Bishops and permutations on chessboard
Mar 30, 2024
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23
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2K
Indirect Proof
(open) The most basic math proof I've ever seen
Dec 19, 2023
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8
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3K
Proof in number theory: the sum of all divisors of n
Nov 23, 2023
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12
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1K
Challenge
Math Challenge Thread (October 2023)
Oct 29, 2023
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25
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Challenge
Math Challenge - July 2023
Jul 31, 2023
2
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69
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6K
Challenge
Math Challenge - June 2023
Jun 20, 2023
3
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80
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Challenge
Math Challenge - December 2021
Dec 11, 2022
3
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93
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12K
Challenge
Math Challenge - November 2019
Feb 23, 2022
2
Replies
42
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10K
Challenge
Math Challenge - November 2021
Dec 4, 2021
2
Replies
42
Views
8K
Challenge
Math Challenge - October 2021
Nov 4, 2021
2
Replies
61
Views
9K
Challenge
Math Challenge - September 2021
Oct 17, 2021
3
Replies
100
Views
9K
Simple Induction
Induction proof of Polynomial Division Theorem
Sep 27, 2021
Replies
10
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2K
I have a few questions about Formalization & Pseudo-code
Sep 3, 2021
Replies
19
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Challenge
Math Challenge - July 2021
Aug 31, 2021
3
Replies
93
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8K
Challenge
Math Challenge - August 2021
Aug 26, 2021
2
Replies
46
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6K
How to write this set in set-builder notation?
Aug 10, 2021
Replies
10
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2K
Challenge
Math Challenge - June 2021
Jul 22, 2021
2
Replies
61
Views
7K
Proving a statement about inclusion of subspaces
Jul 21, 2021
Replies
18
Views
2K
Challenge
Math Challenge - December 2020
Jul 20, 2021
2
Replies
60
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9K
Challenge
Math Challenge - October 2020
Jul 19, 2021
Replies
33
Views
8K
Challenge
Math Challenge - January 2021
Jul 18, 2021
3
Replies
86
Views
11K
Span(S) is the intersection of all subspaces of V containing S
Jul 10, 2021
Replies
1
Views
2K
Help with a proof regarding convergent sequence (proof by contradiction)
Jun 23, 2021
Replies
4
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2K
Challenge
Math Challenge - February 2021
Jun 20, 2021
2
Replies
67
Views
9K
Challenge
Math Challenge - May 2021
May 31, 2021
4
Replies
114
Views
8K
Showing continuous function has min or max using Cauchy limit def.
May 31, 2021
Replies
7
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1K
Changing the Statement
Combinatorial proofs & Contraposition
May 16, 2021
Replies
5
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1K
Challenge
Math Challenge - April 2021
May 11, 2021
3
Replies
102
Views
9K
Technique for proving Inclusion-Exclusion principle combinatorically
Apr 25, 2021
Replies
5
Views
2K
Simple Induction
Interesting Algebra Problem
Apr 5, 2021
Replies
2
Views
1K
Challenge
Math Challenge - March 2021
Mar 30, 2021
2
Replies
56
Views
8K
From the limit of the derivative, infer the behavior of the antiderivative
Mar 16, 2021
Replies
19
Views
2K
Indirect Proof
Proof verification: sequence a_n=(−1)^n does not converge
Mar 11, 2021
Replies
1
Views
2K
Existence of isomorphism ϕ:V→V s.t. ϕ(ϕ(v))=−v for all v∈V
Mar 1, 2021
Replies
17
Views
2K
Challenge
Math Challenge - September 2020
Feb 7, 2021
2
Replies
52
Views
10K
Inequalities
Since ε is arbitrarily small, do the inequalities hold?
Feb 7, 2021
Replies
5
Views
2K
Det of Triangular-like Matrix & getting stuck in Algorithmic Proof
Jan 29, 2021
Replies
8
Views
2K
Non Existence
An argument involving well-orders
Jan 22, 2021
Replies
9
Views
2K
Basel Problem Integral: Solving with Calculus
Jan 15, 2021
Replies
6
Views
2K
Proving that a square of an odd integer is also odd
Jan 5, 2021
Replies
3
Views
1K
Showing that real symmetric matrices are diagonalizable
Jan 5, 2021
Replies
2
Views
4K
Disproving a statement about whole numbers
Dec 31, 2020
Replies
20
Views
2K
Can I use recursion/induction to show that N <= x < N+1 for x real
Dec 21, 2020
Replies
10
Views
2K
Contradictory Proof of Supremum of E: Is it Circular?
Dec 19, 2020
Replies
8
Views
1K
Stuck at proving a bounded above Subsequence
Nov 30, 2020
Replies
8
Views
2K
Challenge
Math Challenge - November 2020
Nov 17, 2020
3
Replies
98
Views
13K
Difficulty with "Exists" & "Let" or "Arbitrary"
Nov 15, 2020
Replies
4
Views
2K
Simple Induction
Help with Lemma for proof of AM-GM inequality
Oct 21, 2020
Replies
6
Views
2K
Sum of rational and irrational is irrational
Oct 20, 2020
Replies
6
Views
2K
Constructive Proofs
(open) Boundaries on the roots of splitting real polynomials
Oct 10, 2020
Replies
2
Views
1K
Changing the Statement
Proving $\zeta(2)=\frac{\pi^2}{6}$ via Geometric Series & Substitutions
Oct 8, 2020
Replies
7
Views
2K
Simple Induction
Direct Proofs regarding Induction
Sep 9, 2020
Replies
5
Views
2K
Your favorite Eureka moment for proofs
Sep 6, 2020
2
Replies
37
Views
8K
Consecutive integers and relatively prime numbers
Sep 5, 2020
Replies
1
Views
2K
Constructive Proofs
Munkre's Topology Ch 1 sec. 2, ex. #1:
Aug 30, 2020
Replies
1
Views
2K
Constructive Proofs
Proof of Correspondence theorem
Aug 29, 2020
Replies
1
Views
2K
Challenge
Math Challenge - August 2020
Aug 27, 2020
3
Replies
104
Views
15K
Indirect Proof
(open) Divergent series of inverse primes
Aug 26, 2020
Replies
0
Views
1K
Constructive Proofs
(open) Little Fermat Proof
Aug 20, 2020
Replies
2
Views
1K
Simple Induction
Proving Coprime of Fermat Numbers and Corollary
Aug 19, 2020
Replies
8
Views
2K
Challenge
Math Challenge - July 2020
Jul 20, 2020
4
Replies
137
Views
17K
Challenge
Math Challenge - June 2020
Jun 20, 2020
5
Replies
156
Views
18K
Challenge
Math Challenge - May 2020
Jun 11, 2020
2
Replies
61
Views
11K
Challenge
Math Challenge - October 2018
May 2, 2020
3
Replies
71
Views
11K
Challenge
Math Challenge - April 2020
Apr 30, 2020
5
Replies
150
Views
17K
Challenge
Math Challenge - September 2019
Apr 27, 2020
2
Replies
39
Views
11K
Challenge
Math Challenge - October 2019
Apr 27, 2020
2
Replies
43
Views
11K
Challenge
Math Challenge - March 2020 (Part II)
Apr 24, 2020
2
Replies
51
Views
9K
Challenge
Math Challenge - March 2020
Mar 10, 2020
3
Replies
77
Views
14K
Challenge
Math Challenge - February 2020
Mar 5, 2020
4
Replies
107
Views
17K
Challenge
Math Challenge - January 2020
Mar 5, 2020
2
Replies
64
Views
14K
Challenge
Math Challenge - December 2019
Jan 2, 2020
2
Replies
48
Views
10K
Challenge
Math Experiment: Let's Prove Something
Nov 13, 2019
2
Replies
39
Views
9K
Challenge
Math Challenge - August 2019
Nov 5, 2019
4
Replies
121
Views
20K
Challenge
Riddles and Puzzles: Extend the following to a valid equation
Sep 10, 2019
17
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42K
Challenge
Math Challenge - November 2018
Aug 26, 2019
6
Replies
175
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22K
Challenge
Math Challenge - July 2019
Jul 28, 2019
3
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101
Views
16K
Challenge
Math Challenge - January 2019
Jul 16, 2019
2
Replies
40
Views
15K
Challenge
Math Challenge - June 2019
Jul 6, 2019
2
Replies
46
Views
12K
Challenge
Math Challenge - February 2019
Jun 22, 2019
3
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86
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20K
Challenge
Are You Ready for the Basic Math Challenge This August?
May 16, 2019
2
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57
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10K
Challenge
Math Challenge - May 2019
May 9, 2019
2
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48
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10K
Challenge
Challenge where you have to make each number from four 4s
Apr 22, 2019
2
Replies
35
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Challenge
Math Challenge - April 2019
Apr 13, 2019
3
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83
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Challenge
Math Challenge - March 2019
Mar 31, 2019
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Challenge
Math Challenge - December 2018
Dec 22, 2018
2
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67
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12K
Challenge
Basic Math Challenge - September 2018
Oct 8, 2018
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Challenge
Intermediate Math Challenge - September 2018
Sep 9, 2018
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28
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Challenge
Intermediate Math Challenge - August 2018
Aug 14, 2018
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Challenge
Ready for a Summer Math Challenge?
Aug 12, 2018
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Challenge
Intermediate Math Challenge - July 2018
Jul 28, 2018
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Can You Solve These Summer Math Challenges?
Jul 18, 2018
2
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Challenge
Intermediate Math Challenge - June 2018
Jul 15, 2018
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Intermediate Math Challenge - May 2018
May 31, 2018
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Challenge
Can You Solve These Math Challenges?
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Basic Math Problem of the Week 1/02/2017
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Intermediate Math Problem of the Week 10/17/2017
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Challenge
Advanced Math Problem of the Week 12/20/2017
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Intermediate Math Problem of the Week 12/27/2017
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