Peter Grill
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 Dec 15 awarded Caucus Jul 27 awarded Famous Question Jun 28 awarded Notable Question May 15 awarded Caucus Apr 28 comment Interesting question about irrational numbers Since $7-a-b$ is an integer, $2\sqrt{10}-2\sqrt{ab}$ must also be an integer, and $\sqrt{10}$ is irrational. That should help. Apr 28 revised Domain of a Relation from A to B improved formatting, summarize question Apr 28 asked Domain of a Relation from A to B Apr 28 comment Elementary explanation of determinant I think the best way would be to show example of 2x2, 3x3 systems where the determinant shows up in the solution. Could add that the determinant is a function that takes as input a matrix and yields a number. But have they covered the concept of functions? Feb 25 awarded Popular Question Jan 11 comment $(p \land q)\implies(p \lor q)$, how to make a truth table with $p$ twice? Break it up: First the two usual columns: $p$, $q$. Then build the $p \land q$, and the $p \lor q$ columns from the values in the first two columns. Then build the final column based on columns 3 and 4. Nov 17 revised Exponents in Odd and Even Functions case of f odd, g even Nov 17 revised Exponents in Odd and Even Functions added proff Nov 17 answered Exponents in Odd and Even Functions Nov 16 awarded Yearling Nov 15 answered Are trig identities commutative? Nov 15 answered What's the solution to this system of equation? Nov 6 comment Simple algebra question…exponents? Well whoever told you it was not 1 was wrong. Nov 6 comment Simple algebra question…exponents? I think you understanding is incorrect. That is clearly 1, ($b \ne 0$). The only way that is $b^8$ is the question is $\frac{b^4}{b^{-4}}$ Oct 31 comment Proof by Induction: $\sum_0^nx^i=(1-x^{n+1})/(1-x)$ The left hand side for $n=1$ expands to $x^0+x^1 = 1 + x, x \ne 0$ Oct 31 answered Proof by Induction: $\sum_0^nx^i=(1-x^{n+1})/(1-x)$