# Category:Pages with Questionable Content

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These are pages containing proofs that are of questionable validity.

See the questionable template.

## Pages in category "Pages with Questionable Content"

The following 110 pages are in this category, out of 110 total.

### A

### B

### C

- Cantor-Bernstein-Schröder Theorem
- Cantor-Bernstein-Schröder Theorem/Proof 4
- Characterization of Lower Semicontinuity
- Definition:Class (Class Theory)
- Class Member of Class Builder
- Definition:Class/Zermelo-Fraenkel
- Closure in Subspace
- Definition:Coefficient of Polynomial
- Compact Hausdorff Topology is Minimal Hausdorff
- Conditions for Internal Group Direct Product
- Conjunction with Tautology/Proof 1
- Construction of Outer Measure
- Continued Fraction Algorithm
- Continuous Functions on Compact Space form Banach Space
- Continuous Image of Compact Space is Compact/Corollary 3
- Continuous Image of Compact Space is Compact/Corollary 3/Proof 2
- Convergents are Best Approximations
- Conversion of Number in Golden Mean Number System to Simplest Form

### D

### E

### F

- Factorial Divides Product of Successive Numbers
- Factors of Integer Congruent to 5 modulo 6
- First Order ODE/y' - f (y) phi' (x) over f' (y) = phi (x) phi' (x) over f' (y)
- Fixed Point of Mappings is Fixed Point of Composition/General Result
- Floor of x+m over n
- Floor of x+m over n/Proof 1
- Fourier Series/1 over -1 to 0, Cosine of x over 0 to 1
- Fourier Series/x over 0 to 2, x-2 over 2 to 4
- Fourth Isomorphism Theorem

### I

### L

- Lagrange's Four Square Theorem
- Lagrange's Four Square Theorem/Proof 2
- Definition:Leading Coefficient of Polynomial
- Lebesgue Integral is Extension of Riemann Integral
- Limit at Infinity of Polynomial over Complex Exponential
- Definition:Limit Point/Topology/Set
- Definition:Limit Point/Topology/Set/Definition 5
- Logarithm of Infinite Product of Complex Functions/Corollary
- Logarithmic Derivative of Infinite Product of Analytic Functions
- Logical Consequence with Union

### M

### N

### O

### P

- Pair is Union of Singletons
- Power of 2 is Difference between Two Powers
- Power Series Expansion for Exponential of Tangent of x
- Prime Enumeration Function is Primitive Recursive
- Prime Number Theorem
- Primitive of Exponential of a x by Sine of b x/Proof 2
- Primitive of Exponential of a x by Sine of b x/Proof 3
- Primitive of Reciprocal of p plus q by Cosine of a x
- Primitive of Reciprocal of p plus q by Cosine of a x/Proof 2
- Primitive of Reciprocal of Root of x squared minus a squared/Logarithm Form
- Definition:Primitive Recursion/One Variable
- Principle of Finite Induction
- Principle of Finite Induction/Proof 2
- Product of Two Distinct Primes has 4 Positive Divisors
- Proper Subset of Finite Ordinal is Equivalent to Smaller Ordinal

### R

### S

- Second Derivative of Locus of Cycloid
- Set Equivalence is Equivalence Relation
- Set of all Sets
- Set of Gödel Numbers of Arithmetic Theorems Not Definable in Arithmetic
- Simple Infinite Continued Fraction Converges
- Size of Tree is One Less than Order
- Size of Tree is One Less than Order/Necessary Condition
- Solution to Legendre's Differential Equation
- Definition:Spanning Subgraph
- Square of Vandermonde Matrix
- Subspace of Real Continuous Functions
- Sufficient Condition for Vector Equals Inverse iff Zero
- Surjection Induced by Powerset is Induced by Surjection