Question

a={x belongs to W / x <2}
b={x belongs to N /1 < x less than or equal to 2}
c={3,4}
verify A cross (B intersection C)=(A cross B) intersection (A crossC)

Answer 1

$.heart {</p><p> background-color: red;</p><p> display: inline-block;</p><p> height: 50px;</p><p> margin: 10px;</p><p> position: relative;</p><p> top: 5;</p><p> transform: rotate(-45deg);</p><p> position: absolute; </p><p> left: 45%; top: 45%;</p><p> width: 50px;</p><p>}</p><p></p><p>.heart:before,</p><p>.heart:after {</p><p> content: "";</p><p> background-color: red;</p><p> border-radius: 50%;</p><p> height: 50px;</p><p> position: absolute;</p><p> width: 50px;</p><p>}</p><p></p><p>.heart:before {</p><p> top: -25px;</p><p> left: 0;</p><p>}</p><p></p><p>.heart:after {</p><p> left: 25px;</p><p> top: 0;</p><p>}</p><p>@keyframes heartbeat {</p><p> 0% {</p><p> transform: scale( 1 ); </p><p> }</p><p> 20% {</p><p> transform: scale( 1.25 ) </p><p> translateX(5%) </p><p> translateY(5%);</p><p> } </p><p> 40% {</p><p> transform: scale( 1.5 ) </p><p> translateX(9%) </p><p> translateY(10%);</p><p> }</p><p>}</p><p>.heart {</p><p> animation: heartbeat 1s infinite; // our heart has infinite heartbeat :)</p><p> ...</p><p>}</p><p>$