Top network posts

• 68 If $\dfrac{a}{b} = \dfrac{c}{d}$ why does $\dfrac{a+c}{b + d} = \dfrac{a}{b} = \dfrac{c}{d}$?
• 38 If a matrix commutes with a set of other matrices, what conclusions can be drawn?
• 25 Is The Union of Intervals an Interval or not?
• 21 If $3x^2 -2x+7=0$ then $(x-\frac{1}{3})^2 =$?
• 19 Diagonalisability of 2×2 matrices with repeated eigenvalues
• 19 Why do logarithmic curves not follow the general rules for transformations?
• 16 How many different ways can I get up a flight (of stairs) with 11 steps?
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