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123's user avatar
123's user avatar
123
  • Member for 9 years, 9 months
  • Last seen more than 3 years ago
17 votes

How to stop forgetting proofs - for a first course in Real Analysis?

6 votes

Understandable questions which are hard for non-mathematicians but easy for mathematicians

4 votes

Handwaving gone wrong

2 votes

The maths required for an economics degree

2 votes
Accepted

Why is the improper integral $\int^0_{-\infty}{1\over 3-4x}dx$ divergent?

2 votes
Accepted

judging probability by intuition is not always correct?

2 votes

Learning Mathematics using Khan Academy

2 votes
Accepted

How do I explain why multiplying $0.8 \times 0.8$ is less than $0.8$?

1 vote

Why we can conclude immediately that $x \in B$, if $(x, y) \in A \times B = B \times A$

1 vote

Confusion (Averages)

1 vote

Supposed $a,b \in \mathbb{Z}$. If $ab$ is odd, then $a^{2} + b^{2}$ is even.

1 vote

Solve using Proportions/Multiplication?

1 vote

Probability Counting$ (n-1)!/n!$

1 vote

What to conclude from $ x \in (A \setminus B \cap B \setminus C)$

1 vote
Accepted

How to compute the expected value of the sum of two random variables?

1 vote

Simplifying algebric terms

1 vote

Find the length of a ladder that is leaning against a wall.

1 vote

Solve the following equation

1 vote

Which method of integration do I need?

1 vote

What's an intuitive explanation for integration?

1 vote
Accepted

Find a plane that passes through a given point and contains a given line

1 vote

Prove that for all $x$, $y$ in $\mathbb{R}$ there exist $z$, $g$ such that $x = z + g$, $y = z - g$

1 vote

Rolling a fair die 18 times, what is the probability of rolling 1,2,3,4,5,6 (each) three times?

1 vote
Accepted

Calculating how much money I spent? (23-73 gives

1 vote
Accepted

Show that this piece-wise function defines a differentiable solution

1 vote

show a conclusion from the homomorphism $\phi : \Bbb R _{>0} \to \Bbb R$ such that $\phi (r) = \log(r)$

0 votes

A few intro questions about limits

0 votes

Help me solve B\A and complement of A

0 votes

GCD Using Euclidean Algorithm

0 votes

What is this symbol above the X?