Grace C
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 Apr 16 awarded Popular Question Mar 30 awarded Popular Question Mar 15 awarded Popular Question Feb 19 awarded Popular Question Feb 19 awarded Popular Question Feb 5 awarded Popular Question Jul 2 awarded Curious May 4 accepted Show that $C(n,k) = C(n-1,k) + C(n-1,k-1)$ May 4 asked Show that $C(n,k) = C(n-1,k) + C(n-1,k-1)$ Dec 12 accepted A context-free grammar for the language $L = \{ a^ib^jc^k \space|\space 0 \leq i \leq j \leq i + k \}$ Dec 12 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! Dec 12 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? Dec 12 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 Dec 10 revised Find and draw the image of the triangle with vertices (2,1), (1, 2), (2,2) added 104 characters in body Dec 10 asked Find and draw the image of the triangle with vertices (2,1), (1, 2), (2,2) Dec 9 comment Row Reduction with Cofactor Expansion Oh, I see. Thank you. Dec 9 comment Row Reduction with Cofactor Expansion Thank you! So, why does my calculator and wolframalpha say 396? wolframalpha.com/input/… Dec 9 asked Row Reduction with Cofactor Expansion Dec 8 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 Dec 8 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