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Squares as sum proof
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<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> | |
<semantics> | |
<mtable> | |
<mtr> | |
<mtd> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">∈</mo> | |
<mi mathvariant="normal">ℕ</mi> | |
</mrow> | |
</mtd> | |
</mtr> | |
<mtr> | |
<mtd> | |
<mrow> | |
<mrow> | |
<msup> | |
<mi>x</mi> | |
<mn>2</mn> | |
</msup> | |
<mo stretchy="false">=</mo> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">+</mo> | |
<mn>2</mn> | |
</mrow> | |
</mrow> | |
<mrow> | |
<munderover> | |
<mo stretchy="false">∑</mo> | |
<mrow> | |
<mi>n</mi> | |
<mo stretchy="false">=</mo> | |
<mn>1</mn> | |
</mrow> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">−</mo> | |
<mn>1</mn> | |
</mrow> | |
</munderover> | |
<mi>n</mi> | |
</mrow> | |
</mrow> | |
</mtd> | |
</mtr> | |
<mtr> | |
<mtd> | |
<mrow> | |
<mrow> | |
<msup> | |
<mi>x</mi> | |
<mn>2</mn> | |
</msup> | |
<mo stretchy="false">=</mo> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">+</mo> | |
<mn>2</mn> | |
</mrow> | |
</mrow> | |
<mrow> | |
<mo fence="true" stretchy="false">(</mo> | |
<mrow> | |
<mfrac> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">−</mo> | |
<mn>1</mn> | |
</mrow> | |
<mn>2</mn> | |
</mfrac> | |
</mrow> | |
<mo fence="true" stretchy="false">)</mo> | |
</mrow> | |
<mrow> | |
<mo fence="true" stretchy="false">(</mo> | |
<mrow> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">−</mo> | |
<mn>1</mn> | |
<mo stretchy="false">+</mo> | |
<mn>1</mn> | |
</mrow> | |
</mrow> | |
<mo fence="true" stretchy="false">)</mo> | |
</mrow> | |
</mrow> | |
</mtd> | |
</mtr> | |
<mtr> | |
<mtd> | |
<mrow> | |
<mrow> | |
<msup> | |
<mi>x</mi> | |
<mn>2</mn> | |
</msup> | |
<mo stretchy="false">=</mo> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">+</mo> | |
<mi>x</mi> | |
</mrow> | |
</mrow> | |
<mrow> | |
<mo fence="true" stretchy="false">(</mo> | |
<mrow> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">−</mo> | |
<mn>1</mn> | |
</mrow> | |
</mrow> | |
<mo fence="true" stretchy="false">)</mo> | |
</mrow> | |
</mrow> | |
</mtd> | |
</mtr> | |
<mtr> | |
<mtd> | |
<mrow> | |
<msup> | |
<mi>x</mi> | |
<mn>2</mn> | |
</msup> | |
<mo stretchy="false">=</mo> | |
<mrow> | |
<mi>x</mi> | |
<mo stretchy="false">+</mo> | |
<msup> | |
<mi>x</mi> | |
<mn>2</mn> | |
</msup> | |
<mo stretchy="false">−</mo> | |
<mi>x</mi> | |
</mrow> | |
</mrow> | |
</mtd> | |
</mtr> | |
<mtr> | |
<mtd> | |
<mrow> | |
<msup> | |
<mi>x</mi> | |
<mn>2</mn> | |
</msup> | |
<mo stretchy="false">=</mo> | |
<msup> | |
<mi>x</mi> | |
<mn>2</mn> | |
</msup> | |
</mrow> | |
</mtd> | |
</mtr> | |
</mtable> | |
<annotation encoding="StarMath 5.0">x in setN newline | |
x^2 = x + 2 sum from {n=1} to {x-1} n newline | |
x^2 = x + 2( {x-1} over {2} )(x - 1 + 1) newline | |
x^2 = x + x(x-1) newline | |
x^2 = x + x^2 - x newline | |
x^2 = x^2</annotation> | |
</semantics> | |
</math> |
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