What is wrong with the given proof?
39908
Finding the error in this proof that 1=2
1318
What is wrong with this proof that the power set of the natural numbers is countable?
146867
Combinatorial Proof Of A Number Theory Theorem--Confusion
122226
Incorrect logic in popular proof of the irrationality of $\sqrt2$?
135807
I'm having trouble with a proof by induction
94958
Prob. 6 (d), Chap. 1, in Baby Rudin, 3rd ed: How to complete this proof?
139894
Misunderstanding in Spivak's Proof of the Intermediate Value Theorem
1002
Where is the flaw in this "proof" that 1=2? (Derivative of repeated addition)
118577
Fallacious proof involving trigonometry
115506
What's wrong with this demonstration? (1 = -1)
63559
Is there a more complete way of proving this theorem (that I devised)? OR does this theorem already exist and have a name?
77026
Proof with inequalities
141496
Could someone make the proof into a hinted exercise?
79686
How can I prove these statements?
111122
Proof of a theorem in Hilbert's system
35751
Is There a Problem with This Professor's Proof Concerning Interior and Boundary Points?
87257
How to prove this sequent using natural deduction?