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Completely irrelevant time waster:
#!/your/perl/here use strict; use warnings; { # closure for sub terms my @term_list = ('A'..'Z', 'a'..'z'); sub terms { my $N = shift; my $last = 2*$N-1; my @pairs; my $index = 0; my $globber = ''; while ( $index < $last ) { $globber .= '{' . $term_list[$index++] . ',' . $term_list[$index++] . '}'; } my $terms = join ' + ', glob($globber); return $terms; } } # end closure for sub terms foreach my $n (1..5) { my $terms = terms($n); print "N=$n: <", $terms, ">\n"; } exit; __OUTPUT__ N=1: <A + B> N=2: <AC + AD + BC + BD> N=3: <ACE + ACF + ADE + ADF + BCE + BCF + BDE + BDF> N=4: <ACEG + ACEH + ACFG + ACFH + ADEG + ADEH + ADFG + ADFH + BCEG + B +CEH + BCFG + BCFH + BDEG + BDEH + BDFG + BDFH> N=5: <ACEGI + ACEGJ + ACEHI + ACEHJ + ACFGI + ACFGJ + ACFHI + ACFHJ + +ADEGI + ADEGJ + ADEHI + ADEHJ + ADFGI + ADFGJ + ADFHI + ADFHJ + BCEGI + + BCEGJ + BCEHI + BCEHJ + BCFGI + BCFGJ + BCFHI + BCFHJ + BDEGI + BD +EGJ + BDEHI + BDEHJ + BDFGI + BDFGJ + BDFHI + BDFHJ>

-QM
--
Quantum Mechanics: The dreams stuff is made of


In reply to Re^3: Obtaining terms in an expansion by QM
in thread Obtaining terms in an expansion by randyk

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