Decaf-Math

# 98 Questions

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5
140
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2
108
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151
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366
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5
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1k
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119
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### Transferring a particle to a rectilinear path

Mar 13 '18 at 11:51 Rodrigo de Azevedo 13.4k

4
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93
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158
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### Show that $(x_1,x_2)=(0,0)$ is an unstable fixed point for $\dot{x_1} = -x_1 + x_2^6$, $\dot{x_2} =x_2^3 + x_1^6$

Jan 14 '17 at 12:46 Did 250k
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0
89
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### Proving that, for every $\theta \in \mathbb Q$, $\sin(n!\theta\pi)$ has a limit, using $\epsilon$-$N$ definition of limit

Sep 23 '16 at 13:25 Decaf-Math 3,422
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172
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1k
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3
0
122
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### If a function $f : A \to B$ is not injective, is it possible that $g \circ f$ is injective?

Aug 27 at 11:37 Parth Chauhan 63
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131
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3
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91
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235
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81
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780
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64
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62
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31
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4k
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26
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94
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3
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1
618
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86
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76
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157
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