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en.wikipedia.org/wiki/Mathematical_fallacy

In mathematics, certain kinds of mistaken proof are often exhibited, and sometimes collected, ... 2=1} 2=1 , but can be modified to prove that any number equals any other number. ... Many functions do not have a unique inverse. ... For instance, a naive use of integration by parts can be used to give a false proof that 0 = 1.

mathforum.org/library/drmath/view/57131.html

1 + 1 does not equal 2. What is the math equation that proves this?

www.quora.com/Can-it-be-argued-that-1+1-does-not-equal-2-either-from-a-mathematical-or-philosophical-perspective

Let's define 1 as the common feature of all singleton sets. Then let's define 2 as the common .... Why half plus half equals one (1/2+1/2=1)? · Is this equal 1=1/2(2 )? ...

puzzling.stackexchange.com/questions/5656/when-does-11-3

Nov 27, 2014 ... The following slightly abuses the notion of "equals" but in a way that is common among non-mathematicians (more or less "And the next thing ...

www.debate.org/debates/One-plus-one-does-not-always-equal-two/1

May 2, 2009 ... I affirm the resolution: "One plus one does not always equal two." To clarify, the resolution simply means that 1+1=2 does not always happen.

Apr 5, 2014 ... How to prove that 1+1 does NOT equal 2 ... 1+1=2 did you go to school? ... plus is the Irish on number and it costs on it crops on going to ...

www.purplemath.com/modules/howcan1.htm

That is, if you do the subtraction, 1 – 0.999...9 will not equal zero. But the point of the "dot, dot, dot" is that there is no end; 0.9999... is inifinte. There is no "last" ...

www.dailykos.com/story/2008/6/16/535425/-

Jun 16, 2008 ... The title of this journal insinuated that 1 + 1 does not equal 2, but rather 10 AND 1 (technically, in my first example 2 = 10). I stand firm in that ...