Grace C
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 Feb19 awarded Popular Question Feb5 awarded Popular Question Jul2 awarded Curious May4 accepted Show that $C(n,k) = C(n-1,k) + C(n-1,k-1)$ May4 asked Show that $C(n,k) = C(n-1,k) + C(n-1,k-1)$ Dec12 accepted A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ Dec12 comment A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ Ok, thank you very much! Dec12 comment A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ How about the third attempt? Dec12 revised A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ added 157 characters in body Dec10 revised Find and draw the image of the triangle with vertices (2,1), (1, 2), (2,2) added 104 characters in body Dec10 asked Find and draw the image of the triangle with vertices (2,1), (1, 2), (2,2) Dec9 comment Row Reduction with Cofactor Expansion Oh, I see. Thank you. Dec9 comment Row Reduction with Cofactor Expansion Thank you! So, why does my calculator and wolframalpha say 396? wolframalpha.com/input/… Dec9 asked Row Reduction with Cofactor Expansion Dec8 revised A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ added 278 characters in body Dec8 revised A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ added 2 characters in body Dec8 revised A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ added 71 characters in body Dec8 asked A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ Nov19 accepted Describe the smallest subspace of $M_{2\times 2}$ that contains matrices… Nov19 comment Describe the smallest subspace of $M_{2\times 2}$ that contains matrices… Ah. In that case, the set IS the smallest subspace. It is the basis.