Adds content to the sequences section

Also learns new words. Refs #114

doc/Language/math.pod6

@@ -94,7 +94,7 @@ Which makes also arithmetic operations the most adequate for the particular type
 
     say .33-.22-.11 == 0; # OUTPUT: «True␤»
 
-In this case, all numbers are intepreted as C<Rat>s, which makes the operation exact. In general, most languages would interpret them as floating point numbers,
+In this case, all numbers are interpreted as C<Rat>s, which makes the operation exact. In general, most languages would interpret them as floating point numbers,
 
     say .33.Num -.22.Num - .11.Num; # OUTPUT: «1.3877787807814457e-17␤»
 
@@ -136,6 +136,17 @@ We can, in fact, compute the approximation to the L<golden ratio|https://en.wiki
 
 The L<Math::Sequences|https://github.com/ajs/perl6-Math-Sequences> module includes many mathematical sequences, already defined for you. It defines many L<sequences from the encyclopedia|https://oeis.org/>, some of them with their original name, such as ℤ or ℝ.
 
+Some set operators also operate on sequences, and they can be used to find out if an object is part of it:
+
+    say 876 ∈ (7,14 … * > 1000) ; # OUTPUT: «False␤»
+
+In this particular case, we can find out if C<876> is a multiple of 7 straight away, but the same principle holds for other sequences using complicated generators. And we can use set inclusion operators too:
+
+    say (55,89).Set ⊂ (1,1, * + * … * > 200); # OUTPUT: «True␤»
+
+although it does not take into account if it is effectively a subsequence, just the presence of the two elements here; Sets have no order, and even if you don't explicitly cast the subsequence into a Set or explicitly cast it into a C<Seq> it will be coerced into such for the application of the inclusion operator.
+
+
 =head1 Mathematical constants
 
 Perl 6 includes already a set of mathematical constants as part of the core.

xt/words.pws

@@ -1,3 +1,4 @@
+Planck's
 ShiftJIS
 abi
 absolutepath
@@ -302,6 +303,7 @@ dmg
 documentable
 documentables
 doesnotexist
+dpkg
 dsl
 dsls
 dt
@@ -337,6 +339,7 @@ env
 eof
 eol
 eq
+equalities
 eqv
 erlang
 errno
@@ -815,6 +818,7 @@ orwith
 osname
 osr
 osrs
+otherphi
 oub
 oublock
 outblock
@@ -858,6 +862,7 @@ perlvar
 pgrp
 phaser
 phasers
+phi
 photoshop
 php
 pickpairs
@@ -933,6 +938,7 @@ quaggas
 quanthash
 quantifiervalue
 quasiquoting
+quaternion
 queueing
 queuesize
 quickstart
@@ -1170,6 +1176,7 @@ subscriptable
 subscripted
 subscripting
 subsep
+subsequence
 subsignatures
 subst
 substr
@@ -1379,6 +1386,12 @@ wraphandle
 writehandle
 wrongorder
 ws
+xFA
+xFB
+xFC
+xFD
+xFE
+xFEZ
 xcompose
 xdigit
 xeqv
@@ -1395,16 +1408,4 @@ yot
 yyyy
 zef
 zoffixznet
-zwj
-xFE
-xFEZ
-xFA
-xFB
-xFC
-xFD
-dpkg
-equalities
-quaternion
-phi
-otherphi
-Planck's
+zwj