General Math Forum

Post thread
Join in expert discussion on general math topics that are not applicable to the specific categories. This includes topics are usually high school math level. Homework help is available.

Math Proof Training and Practice

A gap in resources that should help students visualise mathematics

Math Guides, Tutorials and Articles

MHB Deriving the first and second order Newton-Cotes formulas

Math Problem of the Week

Undergrad Sum of an Alternating Series
Graduate Special Functions and Polynomials
  • · Replies 1 ·
Replies
1
Views
5K
Graduate How can a DCT help identify the obvious frequency of a discrete wave?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate A filter with a narrower-than-Fourier Transform passband?
  • · Replies 1 ·
Replies
1
Views
2K
High School What are trigonometric identities
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Prime number distribution and hit in a carrom game
  • · Replies 1 ·
Replies
1
Views
2K
Graduate 0-1 kNapsack problem FPTAS algorithm
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Proving Mobius Behaving Pair with Möbius Function μ(n)
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Basic Math Problem of the Week 9/21/2017
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Intermediate Math Problem of the Week 10/25/2017
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Convex Optimization Without Slater Condition
  • · Replies 1 ·
Replies
1
Views
1K
Graduate What is Fermat's little theorem
  • · Replies 1 ·
Replies
1
Views
2K
MHB Solve Sticky Spitballs Art Puzzle: Bob, Cal, Don & Baum
  • · Replies 3 ·
Replies
3
Views
2K
MHB Solving Cubic Root Algebra: Don't Know the Steps
  • · Replies 2 ·
Replies
2
Views
2K
MHB Logarithm Identity: Prove Loga(1/x)=log1/x(a)
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Solving this Equation that Wolfram Alpha doesn't compute....
  • · Replies 5 ·
Replies
5
Views
2K
MHB [ASK] Proof of Some Quadratic Functions
  • · Replies 6 ·
Replies
6
Views
2K
MHB Prove q((p^2)-1)=2: Struggling to Crack the Math Problem
  • · Replies 1 ·
Replies
1
Views
2K
MHB Seeking a specific formula to allow for materials shrinkage
  • · Replies 4 ·
Replies
4
Views
2K
MHB Time for truck to go down ramp and reach point B
  • · Replies 4 ·
Replies
4
Views
4K
MHB Order Matters: Intro to Pure Mathematics Module
  • · Replies 1 ·
Replies
1
Views
3K
MHB Prove the inequality (a^3-c^3)/3≥abc((a-b)/c+(b-c)/a)
  • · Replies 3 ·
Replies
3
Views
2K
High School Can Negative Numbers Be in the Domain of the Square Root Function?
  • · Replies 4 ·
Replies
4
Views
5K
Insights A Pure Hamiltonian Proof of the Maupertuis Principle - Comments
  • · Replies 1 ·
Replies
1
Views
2K
MHB What is the minimum sum of fractions with positive numbers and permutations?
  • · Replies 2 ·
Replies
2
Views
2K
MHB Show that a^(2n)≡1 (mod 2^(n+2))
  • · Replies 9 ·
Replies
9
Views
6K
MHB How to Pronounce A' in Transformations | ASK
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Who is Right: Backward Difference Table or Forward Difference Table?
  • · Replies 6 ·
Replies
6
Views
4K
High School Is 1*0 Truly Equal to 0 in Physical Reality?
  • · Replies 1 ·
Replies
1
Views
1K
High School Is Implicit Function Theorem Useful in Optimal Control Theory?
  • · Replies 4 ·
Replies
4
Views
2K
MHB What is the positive integer $n$ with a special property?
  • · Replies 2 ·
Replies
2
Views
2K
MHB Area of Triangle ABC: Find the Solution
  • · Replies 2 ·
Replies
2
Views
2K
MHB Prove the binomial identity ∑(-1)^j(n choose j)=0
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Discrete Optimization Problem?
  • · Replies 3 ·
Replies
3
Views
2K
MHB Use Variables to Create Function
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Is a Vertical Line the Correct Depiction for this Equation?
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Why is Graham's number a factor of 3?
  • · Replies 12 ·
Replies
12
Views
5K
MHB Parallelogram with diagonals. Need to find the area (S).
  • · Replies 5 ·
Replies
5
Views
2K
Is Karen Uhlenbeck the First Woman to Win the Abel Prize?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Chord Length: A Mathematical Observation
  • · Replies 7 ·
Replies
7
Views
2K
High School Is 0.999... really equal to 1? Examining the proof.
  • · Replies 3 ·
Replies
3
Views
2K
MHB Inequality involves radical, square and factorial expression 3√{x}+2y+1z^2⩽ 13
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Polynomial of finite degree actually infinite degree?
  • · Replies 30 ·
2
Replies
30
Views
5K
MHB Is Tan(cos2x) equal to tan(2 cos^-1(x))?
  • · Replies 5 ·
Replies
5
Views
6K
MHB Solving Cubic Equation: x^3 - kx + (k + 11) = 0
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Wallis' Formula and Quantum Mechanics
  • · Replies 3 ·
Replies
3
Views
2K
MHB Find Common Difference of A.P. Given G.P. & Logarithms
  • · Replies 6 ·
Replies
6
Views
2K
MHB Questions on Pell's & Non-Linear Diophantine Equations UG Level
  • · Replies 2 ·
Replies
2
Views
2K
High School Why is x2 . y2 not equal to (x-y) (x+y)?
  • · Replies 1 ·
Replies
1
Views
1K
MHB Ratio word problem: What fraction of the original counters remain in the bag
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Diophantine Equation with no solutions
  • · Replies 6 ·
Replies
6
Views
2K
High School Is Zero Divided by Zero Equal to One?
  • · Replies 2 ·
Replies
2
Views
2K
MHB A positive integer divisible by 2019 the sum of whose decimal digits is 2019.
  • · Replies 2 ·
Replies
2
Views
2K
MHB Determine all real x in x^n+x^(-n)
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Absorption of Radiation: Calculating Sphere Area
  • · Replies 11 ·
Replies
11
Views
3K
High School What does this mysterious formula found in a financial institution mean?
  • · Replies 3 ·
Replies
3
Views
1K
MHB Number of Possible Sums with 1-15 Cards
  • · Replies 3 ·
Replies
3
Views
4K
MHB Ordered pair (x,y): x choose y = 2020
  • · Replies 2 ·
Replies
2
Views
1K
Graduate How is mathematics related to creativity?
  • · Replies 7 ·
Replies
7
Views
4K
MHB Proving Addition/Subtraction Formulas - Tan(x-y)+Tan(y-z)+Tan(z-x)
  • · Replies 4 ·
Replies
4
Views
3K
MHB Graph the function y=-1/2[cos(x+pi)+cos(x-pi)] and make a conjecture
  • · Replies 2 ·
Replies
2
Views
2K
MHB Express in terms of sine function of f(x)=sinx+cosx
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Periodic potential V(x) -- how can I show that the period is d?
  • · Replies 3 ·
Replies
3
Views
2K
MHB Four Capacitors: What is the charge on C4
  • · Replies 1 ·
Replies
1
Views
2K
MHB [ASK] Exponents and Roots Simplification problem
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad All partitions of 10 into size 6
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Line count in a simple program
  • · Replies 16 ·
Replies
16
Views
3K
MHB Question: What is the value of ⌊ 2020/(1+2+3+...+2019)⌋?
  • · Replies 2 ·
Replies
2
Views
2K
MHB What Do These Numbers Represent?
  • · Replies 1 ·
Replies
1
Views
2K
MHB Graph of P(x) Under |y| Transformations: a & b
  • · Replies 2 ·
Replies
2
Views
2K
MHB Finding the impedance in rectangular and polar form
  • · Replies 11 ·
Replies
11
Views
4K
MHB Evaluate ⌊ 1/a_1+1/a_2+....+1/a_{2008} ⌋
  • · Replies 2 ·
Replies
2
Views
2K
High School Do you visualize equations abstracly when doing math?
  • · Replies 18 ·
Replies
18
Views
3K
MHB Binomial Sum \displaystyle \sum^{n}_{k=0}\binom{n+k}{k}\cdot \frac{1}{2^k}
  • · Replies 1 ·
Replies
1
Views
2K
MHB Challenge Problem #6: Prove tan 18°=√(1-2/√5)
  • · Replies 3 ·
Replies
3
Views
2K
MHB Challenge question on equilateral triangle: Prove ∠DBA=42°
  • · Replies 5 ·
Replies
5
Views
2K
MHB How does 12 + j16 become 20 ∠53.1° in impedance calculations?
  • · Replies 2 ·
Replies
2
Views
3K
MHB Prove trig identity (cot x -1)/(cot x +1)=(1-sin 2x)/(cos 2x)
  • · Replies 3 ·
Replies
3
Views
2K
MHB What is the linear speed of Santa Fe around the earth's axis in mi/hr
  • · Replies 2 ·
Replies
2
Views
2K
High School Are Algebra, Geometry, Probability innate or cultural?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Solve ln(a/b+1) Using Identity ln(a+b)=ln b + ln(a/b+1)
  • · Replies 10 ·
Replies
10
Views
3K
High School Mathematics in STEM fields: GATEKEEPER OR GATEWAY?
  • · Replies 13 ·
Replies
13
Views
3K
MHB What is the formula for the volume of a thick crust pizza?
  • · Replies 215 ·
8
Replies
215
Views
54K
High School Is imaginary "i" a purely aesthetic matter?
  • · Replies 44 ·
2
Replies
44
Views
5K
MHB Find equation of a quadratic with line of symmetry
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad How did Euclid go about forming his propositions?
  • · Replies 13 ·
Replies
13
Views
3K
MHB Solve sqrt (x+ a) = x −7 when a=-1
  • · Replies 4 ·
Replies
4
Views
2K
High School Why x=2x doesn't have three solutions?
  • · Replies 8 ·
Replies
8
Views
3K
MHB Does PEMDAS Apply to All Math Equations?
  • · Replies 1 ·
Replies
1
Views
2K
High School Measuring Angles: Negatives & Quadrants
  • · Replies 1 ·
Replies
1
Views
2K
High School Is there a symbol for "probably equals"?
  • · Replies 32 ·
2
Replies
32
Views
10K
High School Can You Find the Function of a Random Curve on Graph Paper?
  • · Replies 4 ·
Replies
4
Views
2K
High School What are cosine and sine functions called in relation to Pi?
  • · Replies 6 ·
Replies
6
Views
3K
MHB Solving Math Problem: Average Distance from Earth to Proxima Centauri
  • · Replies 1 ·
Replies
1
Views
2K
High School Are f(x) and f(-x) Equivalent Functions?
  • · Replies 2 ·
Replies
2
Views
2K
MHB Kinematics + Trigonometry Application (Physics 12u)
  • · Replies 16 ·
Replies
16
Views
3K
MHB Solve √(x^2+3x+7)-√(x^2-3x+9)+2=0
  • · Replies 5 ·
Replies
5
Views
2K
MHB Least squares method : approximation of a cubic polynomial
  • · Replies 3 ·
Replies
3
Views
3K
Rubik's Cube: A Favorite Puzzle Among IT Experts and Scientists
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Terminology: equation collapse
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad What went wrong in the algebraic steps for ln rules?
  • · Replies 1 ·
Replies
1
Views
2K